diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 3521a2d70b00..c81e8d344486 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -5050,8 +5050,8 @@ static abi_long do_ioctl_dm(const IOCTLEntry *ie, uint8_t *buf_temp, int fd,
     {
         void *gspec = argptr;
         void *cur_data = host_data;
-        const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_target_spec) };
-        int spec_size = thunk_type_size(arg_type, 0);
+        const argtype dm_arg_type[] = { MK_STRUCT(STRUCT_dm_target_spec) };
+        int spec_size = thunk_type_size(dm_arg_type, 0);
         int i;
 
         for (i = 0; i < host_dm->target_count; i++) {
@@ -5059,7 +5059,7 @@ static abi_long do_ioctl_dm(const IOCTLEntry *ie, uint8_t *buf_temp, int fd,
             uint32_t next;
             int slen;
 
-            thunk_convert(spec, gspec, arg_type, THUNK_HOST);
+            thunk_convert(spec, gspec, dm_arg_type, THUNK_HOST);
             slen = strlen((char*)gspec + spec_size) + 1;
             next = spec->next;
             spec->next = sizeof(*spec) + slen;
@@ -5099,7 +5099,7 @@ static abi_long do_ioctl_dm(const IOCTLEntry *ie, uint8_t *buf_temp, int fd,
             struct dm_name_list *nl = (void*)host_dm + host_dm->data_start;
             uint32_t remaining_data = guest_data_size;
             void *cur_data = argptr;
-            const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_name_list) };
+            const argtype dm_arg_type[] = { MK_STRUCT(STRUCT_dm_name_list) };
             int nl_size = 12; /* can't use thunk_size due to alignment */
 
             while (1) {
@@ -5111,7 +5111,7 @@ static abi_long do_ioctl_dm(const IOCTLEntry *ie, uint8_t *buf_temp, int fd,
                     host_dm->flags |= DM_BUFFER_FULL_FLAG;
                     break;
                 }
-                thunk_convert(cur_data, nl, arg_type, THUNK_TARGET);
+                thunk_convert(cur_data, nl, dm_arg_type, THUNK_TARGET);
                 strcpy(cur_data + nl_size, nl->name);
                 cur_data += nl->next;
                 remaining_data -= nl->next;
@@ -5127,8 +5127,8 @@ static abi_long do_ioctl_dm(const IOCTLEntry *ie, uint8_t *buf_temp, int fd,
         {
             struct dm_target_spec *spec = (void*)host_dm + host_dm->data_start;
             void *cur_data = argptr;
-            const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_target_spec) };
-            int spec_size = thunk_type_size(arg_type, 0);
+            const argtype dm_arg_type[] = { MK_STRUCT(STRUCT_dm_target_spec) };
+            int spec_size = thunk_type_size(dm_arg_type, 0);
             int i;
 
             for (i = 0; i < host_dm->target_count; i++) {
@@ -5139,7 +5139,7 @@ static abi_long do_ioctl_dm(const IOCTLEntry *ie, uint8_t *buf_temp, int fd,
                     host_dm->flags |= DM_BUFFER_FULL_FLAG;
                     break;
                 }
-                thunk_convert(cur_data, spec, arg_type, THUNK_TARGET);
+                thunk_convert(cur_data, spec, dm_arg_type, THUNK_TARGET);
                 strcpy(cur_data + spec_size, (char*)&spec[1]);
                 cur_data = argptr + spec->next;
                 spec = (void*)host_dm + host_dm->data_start + next;
@@ -5167,8 +5167,8 @@ static abi_long do_ioctl_dm(const IOCTLEntry *ie, uint8_t *buf_temp, int fd,
             struct dm_target_versions *vers = (void*)host_dm + host_dm->data_start;
             uint32_t remaining_data = guest_data_size;
             void *cur_data = argptr;
-            const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_target_versions) };
-            int vers_size = thunk_type_size(arg_type, 0);
+            const argtype dm_arg_type[] = { MK_STRUCT(STRUCT_dm_target_versions) };
+            int vers_size = thunk_type_size(dm_arg_type, 0);
 
             while (1) {
                 uint32_t next = vers->next;
@@ -5179,7 +5179,7 @@ static abi_long do_ioctl_dm(const IOCTLEntry *ie, uint8_t *buf_temp, int fd,
                     host_dm->flags |= DM_BUFFER_FULL_FLAG;
                     break;
                 }
-                thunk_convert(cur_data, vers, arg_type, THUNK_TARGET);
+                thunk_convert(cur_data, vers, dm_arg_type, THUNK_TARGET);
                 strcpy(cur_data + vers_size, vers->name);
                 cur_data += vers->next;
                 remaining_data -= vers->next;
