diff --git a/source4/smb_server/smb_server.h b/source4/smb_server/smb_server.h
index 1ddbf30..2075305 100644
--- a/source4/smb_server/smb_server.h
+++ b/source4/smb_server/smb_server.h
@@ -479,7 +479,8 @@ struct loadparm_context;
 #define SMBSRV_CALL_NTVFS_BACKEND(cmd) do { \
 	req->ntvfs->async_states->status = cmd; \
 	if (req->ntvfs->async_states->state & NTVFS_ASYNC_STATE_ASYNC) { \
-		DLIST_ADD_END(req->smb_conn->requests, req, struct smbsrv_request *); \
+		if (! (req->prev) && ! (req->next)) \
+			DLIST_ADD_END(req->smb_conn->requests, req, struct smbsrv_request *); \
 	} else { \
 		req->ntvfs->async_states->send_fn(req->ntvfs); \
 	} \