diff --git a/nbd/server.c b/nbd/server.c
index 3927f7789d..83aeed51c7 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -1413,6 +1413,9 @@ static int nbd_receive_request(NBDClient *client, NBDRequest *request,
     if (ret < 0) {
         return ret;
     }
+    if (ret == 0) {
+        return -EIO;
+    }
 
     /* Request
        [ 0 ..  3]   magic   (NBD_REQUEST_MAGIC)