diff --git a/tests/fake.websocket.js b/tests/fake.websocket.js
index e5a2b2d6..a929a71f 100644
--- a/tests/fake.websocket.js
+++ b/tests/fake.websocket.js
@@ -42,7 +42,7 @@ export default class FakeWebSocket {
     }
 
     _getSentData() {
-        const res = new Uint8Array(this._sendQueue.buffer, 0, this.bufferedAmount);
+        const res = this._sendQueue.slice(0, this.bufferedAmount);
         this.bufferedAmount = 0;
         return res;
     }