diff --git a/kasmweb/tests/test.rfb.js b/kasmweb/tests/test.rfb.js
index 89e45e6..826d355 100644
--- a/kasmweb/tests/test.rfb.js
+++ b/kasmweb/tests/test.rfb.js
@@ -91,7 +91,7 @@ describe('Remote Frame Buffer Protocol Client', function () {
     after(FakeWebSocket.restore);
 
     before(function () {
-        this.clock = clock = sinon.useFakeTimers();
+        this.clock = clock = sinon.useFakeTimers(Date.now());
         // sinon doesn't support this yet
         raf = window.requestAnimationFrame;
         window.requestAnimationFrame = setTimeout;