--- a/dom/animation/test/css-animations/test_animation-starttime.html
+++ b/dom/animation/test/css-animations/test_animation-starttime.html
@@ -2,14 +2,16 @@
 <meta charset=utf-8>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <div id="log"></div>
 <script>
 'use strict';
 setup({explicit_done: true});
 SpecialPowers.pushPrefEnv(
-  { "set": [["dom.animations-api.core.enabled", true]]},
+  { "set": 
+      [["dom.animations-api.core.enabled", true],
+       ["privacy.reduceTimerPrecision", false]]},
   function() {
     window.open("file_animation-starttime.html");
   });
 </script>
 </html>