diff --git a/include/block/nbd.h b/include/block/nbd.h
index f745060..040cdd2 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -163,7 +163,7 @@
                           Error **errp);
 int nbd_init(int fd, QIOChannelSocket *sioc, NBDExportInfo *info,
              Error **errp);
-ssize_t nbd_send_request(QIOChannel *ioc, NBDRequest *request);
+int nbd_send_request(QIOChannel *ioc, NBDRequest *request);
 int nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp);
 int nbd_client(int fd);
 int nbd_disconnect(int fd);