diff --git a/weed-fs/src/cmd/weed/master.go b/weed-fs/src/cmd/weed/master.go
index d9418daa4..08134f3bf 100644
--- a/weed-fs/src/cmd/weed/master.go
+++ b/weed-fs/src/cmd/weed/master.go
@@ -138,6 +138,7 @@ func volumeGrowHandler(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusNotAcceptable)
 		writeJson(w, r, map[string]string{"error": err.Error()})
 	} else {
+    w.WriteHeader(http.StatusNotAcceptable)
 		writeJson(w, r, map[string]interface{}{"count": count})
 	}
 }