diff --git a/weed/server/volume_server_handlers.go b/weed/server/volume_server_handlers.go
index afd32fed4..c199fa46a 100644
--- a/weed/server/volume_server_handlers.go
+++ b/weed/server/volume_server_handlers.go
@@ -71,6 +71,7 @@ func (vs *VolumeServer) privateStoreHandler(w http.ResponseWriter, r *http.Reque
 		atomic.AddInt64(&vs.inFlightUploadDataSize, contentLength)
 		defer func() {
 			atomic.AddInt64(&vs.inFlightUploadDataSize, -contentLength)
+			vs.inFlightUploadDataLimitCond.Signal()
 		}()
 
 		// processs uploads