diff --git a/block/nbd.c b/block/nbd.c
index 1f9716094924..3a6e60920304 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -132,7 +132,7 @@ static bool nbd_client_connected(BDRVNBDState *s)
     return qatomic_load_acquire(&s->state) == NBD_CLIENT_CONNECTED;
 }

-static bool nbd_recv_coroutine_wake_one(NBDClientRequest *req)
+static bool coroutine_fn nbd_recv_coroutine_wake_one(NBDClientRequest *req)
 {
     if (req->receiving) {
         req->receiving = false;
@@ -143,7 +143,7 @@ static bool nbd_recv_coroutine_wake_one(NBDClientRequest *req)
     return false;
 }

-static void nbd_recv_coroutines_wake(BDRVNBDState *s, bool all)
+static void coroutine_fn nbd_recv_coroutines_wake(BDRVNBDState *s, bool all)
 {
     int i;

@@ -154,7 +154,7 @@ static void nbd_recv_coroutines_wake(BDRVNBDState *s, bool all)
     }
 }

-static void nbd_channel_error(BDRVNBDState *s, int ret)
+static void coroutine_fn nbd_channel_error(BDRVNBDState *s, int ret)
 {
     if (nbd_client_connected(s)) {
         qio_channel_shutdown(s->ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
@@ -466,9 +466,9 @@ static coroutine_fn int nbd_receive_replies(BDRVNBDState *s, uint64_t handle)
     }
 }

-static int nbd_co_send_request(BlockDriverState *bs,
-                               NBDRequest *request,
-                               QEMUIOVector *qiov)
+static int coroutine_fn nbd_co_send_request(BlockDriverState *bs,
+                                            NBDRequest *request,
+                                            QEMUIOVector *qiov)
 {
     BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
     int rc, i = -1;
@@ -721,9 +721,9 @@ static int nbd_parse_error_payload(NBDStructuredReplyChunk *chunk,
     return 0;
 }

-static int nbd_co_receive_offset_data_payload(BDRVNBDState *s,
-                                              uint64_t orig_offset,
-                                              QEMUIOVector *qiov, Error **errp)
+static int coroutine_fn
+nbd_co_receive_offset_data_payload(BDRVNBDState *s, uint64_t orig_offset,
+                                   QEMUIOVector *qiov, Error **errp)
 {
     QEMUIOVector sub_qiov;
     uint64_t offset;
@@ -1039,8 +1039,8 @@ break_loop:
     return false;
 }

-static int nbd_co_receive_return_code(BDRVNBDState *s, uint64_t handle,
-                                      int *request_ret, Error **errp)
+static int coroutine_fn nbd_co_receive_return_code(BDRVNBDState *s, uint64_t handle,
+                                                   int *request_ret, Error **errp)
 {
     NBDReplyChunkIter iter;

@@ -1053,9 +1053,9 @@ static int nbd_co_receive_return_code(BDRVNBDState *s, uint64_t handle,
     return iter.ret;
 }

-static int nbd_co_receive_cmdread_reply(BDRVNBDState *s, uint64_t handle,
-                                        uint64_t offset, QEMUIOVector *qiov,
-                                        int *request_ret, Error **errp)
+static int coroutine_fn nbd_co_receive_cmdread_reply(BDRVNBDState *s, uint64_t handle,
+                                                     uint64_t offset, QEMUIOVector *qiov,
+                                                     int *request_ret, Error **errp)
 {
     NBDReplyChunkIter iter;
     NBDReply reply;
@@ -1105,10 +1105,10 @@ static int nbd_co_receive_cmdread_reply(BDRVNBDState *s, uint64_t handle,
     return iter.ret;
 }

-static int nbd_co_receive_blockstatus_reply(BDRVNBDState *s,
-                                            uint64_t handle, uint64_t length,
-                                            NBDExtent *extent,
-                                            int *request_ret, Error **errp)
+static int coroutine_fn nbd_co_receive_blockstatus_reply(BDRVNBDState *s,
+                                                         uint64_t handle, uint64_t length,
+                                                         NBDExtent *extent,
+                                                         int *request_ret, Error **errp)
 {
     NBDReplyChunkIter iter;
     NBDReply reply;
@@ -1165,8 +1165,8 @@ static int nbd_co_receive_blockstatus_reply(BDRVNBDState *s,
     return iter.ret;
 }

-static int nbd_co_request(BlockDriverState *bs, NBDRequest *request,
-                          QEMUIOVector *write_qiov)
+static int coroutine_fn nbd_co_request(BlockDriverState *bs, NBDRequest *request,
+                                       QEMUIOVector *write_qiov)
 {
     int ret, request_ret;
     Error *local_err = NULL;
@@ -1202,9 +1202,9 @@ static int nbd_co_request(BlockDriverState *bs, NBDRequest *request,
     return ret ? ret : request_ret;
 }

-static int nbd_client_co_preadv(BlockDriverState *bs, int64_t offset,
-                                int64_t bytes, QEMUIOVector *qiov,
-                                BdrvRequestFlags flags)
+static int coroutine_fn nbd_client_co_preadv(BlockDriverState *bs, int64_t offset,
+                                             int64_t bytes, QEMUIOVector *qiov,
+                                             BdrvRequestFlags flags)
 {
     int ret, request_ret;
     Error *local_err = NULL;
@@ -1261,9 +1261,9 @@ static int nbd_client_co_preadv(BlockDriverState *bs, int64_t offset,
     return ret ? ret : request_ret;
 }

-static int nbd_client_co_pwritev(BlockDriverState *bs, int64_t offset,
-                                 int64_t bytes, QEMUIOVector *qiov,
-                                 BdrvRequestFlags flags)
+static int coroutine_fn nbd_client_co_pwritev(BlockDriverState *bs, int64_t offset,
+                                              int64_t bytes, QEMUIOVector *qiov,
+                                              BdrvRequestFlags flags)
 {
     BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
     NBDRequest request = {
@@ -1286,8 +1286,8 @@ static int nbd_client_co_pwritev(BlockDriverState *bs, int64_t offset,
     return nbd_co_request(bs, &request, qiov);
 }

-static int nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
-                                       int64_t bytes, BdrvRequestFlags flags)
+static int coroutine_fn nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
+                                                    int64_t bytes, BdrvRequestFlags flags)
 {
     BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
     NBDRequest request = {
@@ -1321,7 +1321,7 @@ static int nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
     return nbd_co_request(bs, &request, NULL);
 }

-static int nbd_client_co_flush(BlockDriverState *bs)
+static int coroutine_fn nbd_client_co_flush(BlockDriverState *bs)
 {
     BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
     NBDRequest request = { .type = NBD_CMD_FLUSH };
@@ -1336,8 +1336,8 @@ static int nbd_client_co_flush(BlockDriverState *bs)
     return nbd_co_request(bs, &request, NULL);
 }

-static int nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset,
-                                  int64_t bytes)
+static int coroutine_fn nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset,
+                                               int64_t bytes)
 {
     BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
     NBDRequest request = {
@@ -1913,7 +1913,7 @@ fail:
     return ret;
 }

-static int nbd_co_flush(BlockDriverState *bs)
+static int coroutine_fn nbd_co_flush(BlockDriverState *bs)
 {
     return nbd_client_co_flush(bs);
 }
