diff --git a/js/src/Ice/browser/WSTransceiver.js b/js/src/Ice/browser/WSTransceiver.js
index c2f020e814b..c413c012bf9 100644
--- a/js/src/Ice/browser/WSTransceiver.js
+++ b/js/src/Ice/browser/WSTransceiver.js
@@ -276,7 +276,7 @@ class WSTransceiver
             }
         }
 
-        moreData.value = this._readBuffers.byteLength > 0;
+        moreData.value = this._readBuffers.length > 0;
 
         return byteBuffer.remaining === 0;
     }