diff --git a/core/websock.js b/core/websock.js
index 21327c31..61a3091a 100644
--- a/core/websock.js
+++ b/core/websock.js
@@ -208,7 +208,7 @@ export default class Websock {
                 chunkSize = bytes.length - offset;
             }
 
-            this._sQ.set(bytes.subarray(offset, chunkSize), this._sQlen);
+            this._sQ.set(bytes.subarray(offset, offset + chunkSize), this._sQlen);
             this._sQlen += chunkSize;
             offset += chunkSize;
         }