--- a/gfx/layers/apz/test/mochitest/helper_scroll_over_scrollbar.html
+++ b/gfx/layers/apz/test/mochitest/helper_scroll_over_scrollbar.html
@@ -7,17 +7,18 @@
   <script type="application/javascript">
 
 function* test(testDriver) {
   var subframe = document.getElementById('scroll');
 
   // scroll over the scrollbar, and make sure the subframe scrolls
   var scrollPos = subframe.scrollTop;
   var scrollbarX = (200 + subframe.clientWidth) / 2;
-  yield moveMouseAndScrollWheelOver(subframe, scrollbarX, 100, testDriver);
+  yield synthesizeNativeWheelAndWaitForScrollEvent(subframe, scrollbarX, 100,
+      0, -10, testDriver);
   ok(subframe.scrollTop > scrollPos, "subframe scrolled after wheeling over scrollbar");
 }
 
 waitUntilApzStable()
 .then(runContinuation(test))
 .then(subtestDone);
 
   </script>