diff --git a/slirp/arp_table.c b/slirp/arp_table.c
index f81963bb88..ce19e6e7c0 100644
--- a/slirp/arp_table.c
+++ b/slirp/arp_table.c
@@ -34,9 +34,9 @@ void arp_table_add(Slirp *slirp, uint32_t ip_addr, uint8_t ethaddr[ETH_ALEN])
 
     DEBUG_CALL("arp_table_add");
     DEBUG_ARG("ip = %s", inet_ntoa((struct in_addr){.s_addr = ip_addr}));
-    DEBUG_ARGS((dfd, " hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
-                ethaddr[0], ethaddr[1], ethaddr[2],
-                ethaddr[3], ethaddr[4], ethaddr[5]));
+    DEBUG_ARGS(" hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
+               ethaddr[0], ethaddr[1], ethaddr[2],
+               ethaddr[3], ethaddr[4], ethaddr[5]);
 
     if (ip_addr == 0 || ip_addr == 0xffffffff || ip_addr == broadcast_addr) {
         /* Do not register broadcast addresses */
@@ -79,9 +79,9 @@ bool arp_table_search(Slirp *slirp, uint32_t ip_addr,
     for (i = 0; i < ARP_TABLE_SIZE; i++) {
         if (arptbl->table[i].ar_sip == ip_addr) {
             memcpy(out_ethaddr, arptbl->table[i].ar_sha,  ETH_ALEN);
-            DEBUG_ARGS((dfd, " found hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
-                        out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
-                        out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]));
+            DEBUG_ARGS(" found hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
+                       out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
+                       out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]);
             return 1;
         }
     }
diff --git a/slirp/bootp.c b/slirp/bootp.c
index 7b1af73c95..5ab6692038 100644
--- a/slirp/bootp.c
+++ b/slirp/bootp.c
@@ -37,8 +37,7 @@
 static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE };
 
 #ifdef DEBUG
-#define DPRINTF(fmt, ...) \
-do if (slirp_debug & DBG_CALL) { fprintf(dfd, fmt, ##  __VA_ARGS__); fflush(dfd); } while (0)
+#define DPRINTF(fmt, ...) DEBUG_CALL(fmt, ##__VA_ARGS__)
 #else
 #define DPRINTF(fmt, ...) do{}while(0)
 #endif
diff --git a/slirp/cksum.c b/slirp/cksum.c
index 6d73abf4a0..b9466485b5 100644
--- a/slirp/cksum.c
+++ b/slirp/cksum.c
@@ -124,8 +124,8 @@ int cksum(struct mbuf *m, int len)
 cont:
 #ifdef DEBUG
 	if (len) {
-		DEBUG_ERROR((dfd, "cksum: out of data\n"));
-		DEBUG_ERROR((dfd, " len = %d\n", len));
+		DEBUG_ERROR("cksum: out of data\n");
+		DEBUG_ERROR(" len = %d\n", len);
 	}
 #endif
 	if (mlen == -1) {
diff --git a/slirp/debug.h b/slirp/debug.h
index 6cfa61edb3..ca3a4b04da 100644
--- a/slirp/debug.h
+++ b/slirp/debug.h
@@ -17,18 +17,45 @@
 
 extern int slirp_debug;
 
-#define DEBUG_CALL(x) if (slirp_debug & DBG_CALL) { fprintf(dfd, "%s...\n", x); fflush(dfd); }
-#define DEBUG_ARG(x, y) if (slirp_debug & DBG_CALL) { fputc(' ', dfd); fprintf(dfd, x, y); fputc('\n', dfd); fflush(dfd); }
-#define DEBUG_ARGS(x) if (slirp_debug & DBG_CALL) { fprintf x ; fflush(dfd); }
-#define DEBUG_MISC(x) if (slirp_debug & DBG_MISC) { fprintf x ; fflush(dfd); }
-#define DEBUG_ERROR(x) if (slirp_debug & DBG_ERROR) {fprintf x ; fflush(dfd); }
+#define DEBUG_CALL(fmt, ...) do {               \
+    if (slirp_debug & DBG_CALL) {               \
+        fprintf(dfd, fmt, ##__VA_ARGS__);       \
+        fprintf(dfd, "...\n");                  \
+        fflush(dfd);                            \
+    }                                           \
+} while (0)
+
+#define DEBUG_ARG(fmt, ...) do {                \
+    if (slirp_debug & DBG_CALL) {               \
+        fputc(' ', dfd);                        \
+        fprintf(dfd, fmt, ##__VA_ARGS__);       \
+        fputc('\n', dfd);                       \
+        fflush(dfd);                            \
+    }                                           \
+} while (0)
+
+#define DEBUG_ARGS(fmt, ...) DEBUG_ARG(fmt, ##__VA_ARGS__)
+
+#define DEBUG_MISC(fmt, ...) do {               \
+    if (slirp_debug & DBG_MISC) {               \
+        fprintf(dfd, fmt, ##__VA_ARGS__);       \
+        fflush(dfd);                            \
+    }                                           \
+} while (0)
+
+#define DEBUG_ERROR(fmt, ...) do {              \
+    if (slirp_debug & DBG_ERROR) {              \
+        fprintf(dfd, fmt, ##__VA_ARGS__);       \
+        fflush(dfd);                            \
+    }                                           \
+} while (0)
 
 #else
 
-#define DEBUG_CALL(x)
-#define DEBUG_ARG(x, y)
-#define DEBUG_ARGS(x)
-#define DEBUG_MISC(x)
-#define DEBUG_ERROR(x)
+#define DEBUG_CALL(fmt, ...)
+#define DEBUG_ARG(fmt, ...)
+#define DEBUG_ARGS(fmt, ...)
+#define DEBUG_MISC(fmt, ...)
+#define DEBUG_ERROR(fmt, ...)
 
 #endif
diff --git a/slirp/dhcpv6.c b/slirp/dhcpv6.c
index d266611e85..943a13bca8 100644
--- a/slirp/dhcpv6.c
+++ b/slirp/dhcpv6.c
@@ -92,14 +92,14 @@ static int dhcpv6_parse_info_request(uint8_t *odata, int olen,
                     ri->want_boot_url = true;
                     break;
                 default:
-                    DEBUG_MISC((dfd, "dhcpv6: Unsupported option request %d\n",
-                                req_opt));
+                    DEBUG_MISC("dhcpv6: Unsupported option request %d\n",
+                               req_opt);
                 }
             }
             break;
         default:
-            DEBUG_MISC((dfd, "dhcpv6 info req: Unsupported option %d, len=%d\n",
-                        option, len));
+            DEBUG_MISC("dhcpv6 info req: Unsupported option %d, len=%d\n",
+                       option, len);
         }
 
         odata += len + 4;
@@ -203,7 +203,6 @@ void dhcpv6_input(struct sockaddr_in6 *srcsas, struct mbuf *m)
         dhcpv6_info_request(m->slirp, srcsas, xid, &data[4], data_len - 4);
         break;
     default:
-        DEBUG_MISC((dfd, "dhcpv6_input: Unsupported message type 0x%x\n",
-                    data[0]));
+        DEBUG_MISC("dhcpv6_input: Unsupported message type 0x%x\n", data[0]);
     }
 }
diff --git a/slirp/ip6_icmp.c b/slirp/ip6_icmp.c
index 3c424df591..595647b1b1 100644
--- a/slirp/ip6_icmp.c
+++ b/slirp/ip6_icmp.c
@@ -76,7 +76,7 @@ void icmp6_send_error(struct mbuf *m, uint8_t type, uint8_t code)
     struct ip6 *ip = mtod(m, struct ip6 *);
 
     DEBUG_CALL("icmp6_send_error");
-    DEBUG_ARGS((dfd, " type = %d, code = %d\n", type, code));
+    DEBUG_ARGS(" type = %d, code = %d\n", type, code);
 
     if (IN6_IS_ADDR_MULTICAST(&ip->ip_src) ||
             in6_zero(&ip->ip_src)) {
diff --git a/slirp/ip_icmp.c b/slirp/ip_icmp.c
index 9210eef3f3..af11cfcefe 100644
--- a/slirp/ip_icmp.c
+++ b/slirp/ip_icmp.c
@@ -99,8 +99,8 @@ static int icmp_send(struct socket *so, struct mbuf *m, int hlen)
 
     if (sendto(so->s, m->m_data + hlen, m->m_len - hlen, 0,
                (struct sockaddr *)&addr, sizeof(addr)) == -1) {
-        DEBUG_MISC((dfd, "icmp_input icmp sendto tx errno = %d-%s\n",
-                    errno, strerror(errno)));
+        DEBUG_MISC("icmp_input icmp sendto tx errno = %d-%s\n",
+                   errno, strerror(errno));
         icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
         icmp_detach(so);
     }
@@ -165,8 +165,8 @@ icmp_input(struct mbuf *m, int hlen)
         return;
       }
       if (udp_attach(so, AF_INET) == -1) {
-	DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n",
-		    errno,strerror(errno)));
+	DEBUG_MISC("icmp_input udp_attach errno = %d-%s\n",
+               errno,strerror(errno));
 	sofree(so);
 	m_free(m);
 	goto end_error;
@@ -188,8 +188,8 @@ icmp_input(struct mbuf *m, int hlen)
 
       if(sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
 		(struct sockaddr *)&addr, sockaddr_size(&addr)) == -1) {
-	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
-		    errno,strerror(errno)));
+	DEBUG_MISC("icmp_input udp sendto tx errno = %d-%s\n",
+               errno,strerror(errno));
 	icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
 	udp_detach(so);
       }
@@ -257,7 +257,7 @@ icmp_send_error(struct mbuf *msrc, u_char type, u_char code, int minsize,
   { char bufa[20], bufb[20];
     strcpy(bufa, inet_ntoa(ip->ip_src));
     strcpy(bufb, inet_ntoa(ip->ip_dst));
-    DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
+    DEBUG_MISC(" %.16s to %.16s\n", bufa, bufb);
   }
 #endif
   if(ip->ip_off & IP_OFFMASK) goto end_error;    /* Only reply to fragment 0 */
@@ -457,8 +457,8 @@ void icmp_receive(struct socket *so)
         } else {
             error_code = ICMP_UNREACH_HOST;
         }
-        DEBUG_MISC((dfd, " udp icmp rx errno = %d-%s\n", errno,
-                    strerror(errno)));
+        DEBUG_MISC(" udp icmp rx errno = %d-%s\n", errno,
+                   strerror(errno));
         icmp_send_error(so->so_m, ICMP_UNREACH, error_code, 0, strerror(errno));
     } else {
         icmp_reflect(so->so_m);
diff --git a/slirp/mbuf.c b/slirp/mbuf.c
index aa1f28afb1..d8d275e0e7 100644
--- a/slirp/mbuf.c
+++ b/slirp/mbuf.c
@@ -232,7 +232,7 @@ dtom(Slirp *slirp, void *dat)
 	  }
 	}
 
-	DEBUG_ERROR((dfd, "dtom failed"));
+	DEBUG_ERROR("dtom failed");
 
 	return (struct mbuf *)0;
 }
diff --git a/slirp/ndp_table.c b/slirp/ndp_table.c
index e1676a0a7b..a4e6421fd3 100644
--- a/slirp/ndp_table.c
+++ b/slirp/ndp_table.c
@@ -19,9 +19,9 @@ void ndp_table_add(Slirp *slirp, struct in6_addr ip_addr,
     inet_ntop(AF_INET6, &(ip_addr), addrstr, INET6_ADDRSTRLEN);
     DEBUG_ARG("ip = %s", addrstr);
 #endif
-    DEBUG_ARGS((dfd, " hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
-                ethaddr[0], ethaddr[1], ethaddr[2],
-                ethaddr[3], ethaddr[4], ethaddr[5]));
+    DEBUG_ARGS(" hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
+               ethaddr[0], ethaddr[1], ethaddr[2],
+               ethaddr[3], ethaddr[4], ethaddr[5]);
 
     if (IN6_IS_ADDR_MULTICAST(&ip_addr) || in6_zero(&ip_addr)) {
         /* Do not register multicast or unspecified addresses */
@@ -69,18 +69,18 @@ bool ndp_table_search(Slirp *slirp, struct in6_addr ip_addr,
         out_ethaddr[3] = ip_addr.s6_addr[13];
         out_ethaddr[4] = ip_addr.s6_addr[14];
         out_ethaddr[5] = ip_addr.s6_addr[15];
-        DEBUG_ARGS((dfd, " multicast addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
-                    out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
-                    out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]));
+        DEBUG_ARGS(" multicast addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
+                   out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
+                   out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]);
         return 1;
     }
 
     for (i = 0; i < NDP_TABLE_SIZE; i++) {
         if (in6_equal(&ndp_table->table[i].ip_addr, &ip_addr)) {
             memcpy(out_ethaddr, ndp_table->table[i].eth_addr,  ETH_ALEN);
-            DEBUG_ARGS((dfd, " found hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
-                        out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
-                        out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]));
+            DEBUG_ARGS(" found hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
+                       out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
+                       out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]);
             return 1;
         }
     }
diff --git a/slirp/slirp.c b/slirp/slirp.c
index 238629228f..8da528afaa 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -984,12 +984,12 @@ int if_encap(Slirp *slirp, struct mbuf *ifm)
     }
 
     memcpy(eh->h_dest, ethaddr, ETH_ALEN);
-    DEBUG_ARGS((dfd, " src = %02x:%02x:%02x:%02x:%02x:%02x\n",
-                eh->h_source[0], eh->h_source[1], eh->h_source[2],
-                eh->h_source[3], eh->h_source[4], eh->h_source[5]));
-    DEBUG_ARGS((dfd, " dst = %02x:%02x:%02x:%02x:%02x:%02x\n",
-                eh->h_dest[0], eh->h_dest[1], eh->h_dest[2],
-                eh->h_dest[3], eh->h_dest[4], eh->h_dest[5]));
+    DEBUG_ARGS(" src = %02x:%02x:%02x:%02x:%02x:%02x\n",
+               eh->h_source[0], eh->h_source[1], eh->h_source[2],
+               eh->h_source[3], eh->h_source[4], eh->h_source[5]);
+    DEBUG_ARGS(" dst = %02x:%02x:%02x:%02x:%02x:%02x\n",
+               eh->h_dest[0], eh->h_dest[1], eh->h_dest[2],
+               eh->h_dest[3], eh->h_dest[4], eh->h_dest[5]);
     memcpy(buf + sizeof(struct ethhdr), ifm->m_data, ifm->m_len);
     slirp->cb->output(slirp->opaque, buf, ifm->m_len + ETH_HLEN);
     return 1;
diff --git a/slirp/socket.c b/slirp/socket.c
index 7012c7c07d..677fd20c9d 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -208,7 +208,7 @@ soread(struct socket *so)
 				}
 			}
 
-			DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno)));
+			DEBUG_MISC(" --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno));
 			sofcantrcvmore(so);
 
 			if (err == ECONNRESET || err == ECONNREFUSED
@@ -237,7 +237,7 @@ soread(struct socket *so)
                 nn += ret;
         }
 
-	DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
+	DEBUG_MISC(" ... read nn = %d bytes\n", nn);
 
 	/* Update fields */
 	sb->sb_cc += nn;
@@ -370,7 +370,7 @@ sosendoob(struct socket *so)
 		n = slirp_send(so, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 #ifdef DEBUG
 		if (n != len) {
-			DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
+			DEBUG_ERROR("Didn't send all data urgently XXXXX\n");
 		}
 #endif
 	}
@@ -379,7 +379,7 @@ sosendoob(struct socket *so)
 		return n;
 	}
 	so->so_urgc -= n;
-	DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
+	DEBUG_MISC(" ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc);
 
 	sb->sb_cc -= n;
 	sb->sb_rptr += n;
@@ -460,7 +460,7 @@ sowrite(struct socket *so)
             if (ret > 0)
                 nn += ret;
         }
-        DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
+        DEBUG_MISC("  ... wrote nn = %d bytes\n", nn);
 
 	/* Update sbuf */
 	sb->sb_cc -= nn;
@@ -478,8 +478,8 @@ sowrite(struct socket *so)
 	return nn;
 
 err_disconnected:
-	DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
-		    so->so_state, errno));
+	DEBUG_MISC(" --- sowrite disconnected, so->so_state = %x, errno = %d\n",
+               so->so_state, errno);
 	sofcantsendmore(so);
 	tcp_sockclosed(sototcpcb(so));
 	return -1;
@@ -512,8 +512,8 @@ sorecvfrom(struct socket *so)
 	    if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 	    else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 
-	    DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n",
-			errno,strerror(errno)));
+	    DEBUG_MISC(" udp icmp rx errno = %d-%s\n",
+                   errno,strerror(errno));
 	    icmp_send_error(so->so_m, ICMP_UNREACH, code, 0, strerror(errno));
 	  } else {
 	    icmp_reflect(so->so_m);
@@ -564,8 +564,8 @@ sorecvfrom(struct socket *so)
 
 	  m->m_len = recvfrom(so->s, m->m_data, len, 0,
 			      (struct sockaddr *)&addr, &addrlen);
-	  DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n",
-		      m->m_len, errno,strerror(errno)));
+	  DEBUG_MISC(" did recvfrom %d, errno = %d-%s\n",
+                 m->m_len, errno,strerror(errno));
 	  if(m->m_len<0) {
 	    /* Report error as ICMP */
 	    switch (so->so_lfamily) {
@@ -579,7 +579,7 @@ sorecvfrom(struct socket *so)
 		code = ICMP_UNREACH_NET;
 	      }
 
-	      DEBUG_MISC((dfd, " rx error, tx icmp ICMP_UNREACH:%i\n", code));
+	      DEBUG_MISC(" rx error, tx icmp ICMP_UNREACH:%i\n", code);
 	      icmp_send_error(so->so_m, ICMP_UNREACH, code, 0, strerror(errno));
 	      break;
 	    case AF_INET6:
@@ -591,7 +591,7 @@ sorecvfrom(struct socket *so)
 		code = ICMP6_UNREACH_NO_ROUTE;
 	      }
 
-	      DEBUG_MISC((dfd, " rx error, tx icmp6 ICMP_UNREACH:%i\n", code));
+	      DEBUG_MISC(" rx error, tx icmp6 ICMP_UNREACH:%i\n", code);
 	      icmp6_send_error(so->so_m, ICMP6_UNREACH, code);
 	      break;
 	    default:
@@ -839,9 +839,9 @@ void sotranslate_out(struct socket *so, struct sockaddr_storage *addr)
             }
         }
 
-        DEBUG_MISC((dfd, " addr.sin_port=%d, "
-            "addr.sin_addr.s_addr=%.16s\n",
-            ntohs(sin->sin_port), inet_ntoa(sin->sin_addr)));
+        DEBUG_MISC(" addr.sin_port=%d, "
+                   "addr.sin_addr.s_addr=%.16s\n",
+                   ntohs(sin->sin_port), inet_ntoa(sin->sin_addr));
         break;
 
     case AF_INET6:
diff --git a/slirp/tcp_input.c b/slirp/tcp_input.c
index 922dbe32eb..e33fb83df5 100644
--- a/slirp/tcp_input.c
+++ b/slirp/tcp_input.c
@@ -236,8 +236,8 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso, unsigned short af)
     Slirp *slirp;
 
 	DEBUG_CALL("tcp_input");
-	DEBUG_ARGS((dfd, " m = %p  iphlen = %2d  inso = %p\n",
-		    m, iphlen, inso));
+	DEBUG_ARGS(" m = %p  iphlen = %2d  inso = %p\n",
+               m, iphlen, inso);
 
 	/*
 	 * If called with m == 0, then we're continuing the connect
@@ -662,8 +662,8 @@ findso:
               (errno != EINPROGRESS) && (errno != EWOULDBLOCK)
           ) {
 	    uint8_t code;
-	    DEBUG_MISC((dfd, " tcp fconnect errno = %d-%s\n",
-			errno,strerror(errno)));
+	    DEBUG_MISC(" tcp fconnect errno = %d-%s\n",
+                   errno,strerror(errno));
 	    if(errno == ECONNREFUSED) {
 	      /* ACK the SYN, send RST to refuse the connection */
 	      tcp_respond(tp, ti, m, ti->ti_seq + 1, (tcp_seq) 0,
@@ -1032,8 +1032,7 @@ trimthenstep6:
 
 		if (SEQ_LEQ(ti->ti_ack, tp->snd_una)) {
 			if (ti->ti_len == 0 && tiwin == tp->snd_wnd) {
-			  DEBUG_MISC((dfd, " dup ack  m = %p  so = %p\n",
-				      m, so));
+			  DEBUG_MISC(" dup ack  m = %p  so = %p\n", m, so);
 				/*
 				 * If we have outstanding data (other than
 				 * a window probe), this is a completely
@@ -1411,7 +1410,7 @@ tcp_dooptions(struct tcpcb *tp, u_char *cp, int cnt, struct tcpiphdr *ti)
 	int opt, optlen;
 
 	DEBUG_CALL("tcp_dooptions");
-	DEBUG_ARGS((dfd, " tp = %p  cnt=%i\n", tp, cnt));
+	DEBUG_ARGS(" tp = %p  cnt=%i\n", tp, cnt);
 
 	for (; cnt > 0; cnt -= optlen, cp += optlen) {
 		opt = cp[0];
@@ -1611,7 +1610,7 @@ tcp_mss(struct tcpcb *tp, u_int offer)
                                                (mss - (TCP_RCVSPACE % mss)) :
                                                0));
 
-	DEBUG_MISC((dfd, " returning mss = %d\n", mss));
+	DEBUG_MISC(" returning mss = %d\n", mss);
 
 	return mss;
 }
diff --git a/slirp/tcp_output.c b/slirp/tcp_output.c
index 90b5c376f7..44da8a4e47 100644
--- a/slirp/tcp_output.c
+++ b/slirp/tcp_output.c
@@ -92,7 +92,7 @@ again:
 
 	flags = tcp_outflags[tp->t_state];
 
-	DEBUG_MISC((dfd, " --- tcp_output flags = 0x%x\n",flags));
+	DEBUG_MISC(" --- tcp_output flags = 0x%x\n", flags);
 
 	/*
 	 * If in persist timeout with window of 0, send 1 byte.
diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
index 4b40850c7a..00cee73163 100644
--- a/slirp/tcp_subr.c
+++ b/slirp/tcp_subr.c
@@ -420,7 +420,7 @@ int tcp_fconnect(struct socket *so, unsigned short af)
     qemu_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
 
     addr = so->fhost.ss;
-    DEBUG_CALL(" connect()ing")
+    DEBUG_CALL(" connect()ing");
     sotranslate_out(so, &addr);
 
     /* We don't care what port we get */
@@ -964,7 +964,7 @@ int tcp_ctl(struct socket *so)
                     so->chardev = ex_ptr->ex_chardev;
                     return 1;
                 }
-                DEBUG_MISC((dfd, " executing %s\n", ex_ptr->ex_exec));
+                DEBUG_MISC(" executing %s\n", ex_ptr->ex_exec);
                 return fork_exec(so, ex_ptr->ex_exec);
             }
         }
diff --git a/slirp/udp.c b/slirp/udp.c
index c47870a61b..a45ad81dda 100644
--- a/slirp/udp.c
+++ b/slirp/udp.c
@@ -172,8 +172,8 @@ udp_input(register struct mbuf *m, int iphlen)
 	   */
 	  so = socreate(slirp);
 	  if (udp_attach(so, AF_INET) == -1) {
-	    DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
-			errno,strerror(errno)));
+	    DEBUG_MISC(" udp_attach errno = %d-%s\n",
+                   errno, strerror(errno));
 	    sofree(so);
 	    goto bad;
 	  }
@@ -209,7 +209,7 @@ udp_input(register struct mbuf *m, int iphlen)
 	  m->m_len += iphlen;
 	  m->m_data -= iphlen;
 	  *ip=save_ip;
-	  DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
+	  DEBUG_MISC("udp tx errno = %d-%s\n", errno, strerror(errno));
 	  icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0,
 	                  strerror(errno));
 	  goto bad;
diff --git a/slirp/udp6.c b/slirp/udp6.c
index 986010f0d3..473ba1586e 100644
--- a/slirp/udp6.c
+++ b/slirp/udp6.c
@@ -92,8 +92,8 @@ void udp6_input(struct mbuf *m)
         /* If there's no socket for this packet, create one. */
         so = socreate(slirp);
         if (udp_attach(so, AF_INET6) == -1) {
-            DEBUG_MISC((dfd, " udp6_attach errno = %d-%s\n",
-                        errno, strerror(errno)));
+            DEBUG_MISC(" udp6_attach errno = %d-%s\n",
+                       errno, strerror(errno));
             sofree(so);
             goto bad;
         }
@@ -119,7 +119,7 @@ void udp6_input(struct mbuf *m)
         m->m_len += iphlen;
         m->m_data -= iphlen;
         *ip = save_ip;
-        DEBUG_MISC((dfd, "udp tx errno = %d-%s\n", errno, strerror(errno)));
+        DEBUG_MISC("udp tx errno = %d-%s\n", errno, strerror(errno));
         icmp6_send_error(m, ICMP6_UNREACH, ICMP6_UNREACH_NO_ROUTE);
         goto bad;
     }
