diff --git a/src/components/progressCircular/js/progressCircularDirective.js b/src/components/progressCircular/js/progressCircularDirective.js
index 566d32009af..9422d6801f6 100644
--- a/src/components/progressCircular/js/progressCircularDirective.js
+++ b/src/components/progressCircular/js/progressCircularDirective.js
@@ -53,8 +53,15 @@ function MdProgressCircularDirective($window, $mdProgressCircular, $mdTheming,
 
   // Note that this shouldn't use use $$rAF, because it can cause an infinite loop
   // in any tests that call $animate.flush.
-  var rAF = $window.requestAnimationFrame || angular.noop;
-  var cAF = $window.cancelAnimationFrame || angular.noop;
+  var rAF = $window.requestAnimationFrame ||
+            $window.webkitRequestAnimationFrame ||
+            angular.noop;
+
+  var cAF = $window.cancelAnimationFrame ||
+            $window.webkitCancelAnimationFrame ||
+            $window.webkitCancelRequestAnimationFrame ||
+            angular.noop;
+
   var DEGREE_IN_RADIANS = $window.Math.PI / 180;
   var MODE_DETERMINATE = 'determinate';
   var MODE_INDETERMINATE = 'indeterminate';
@@ -208,8 +215,8 @@ function MdProgressCircularDirective($window, $mdProgressCircular, $mdTheming,
       if (animateTo === animateFrom) {
         path.attr('d', getSvgArc(animateTo, diameter, pathDiameter, rotation));
       } else {
-        lastDrawFrame = rAF(function animation(now) {
-          var currentTime = $window.Math.max(0, $window.Math.min((now || $mdUtil.now()) - startTime, animationDuration));
+        lastDrawFrame = rAF(function animation() {
+          var currentTime = $window.Math.max(0, $window.Math.min($mdUtil.now() - startTime, animationDuration));
 
           path.attr('d', getSvgArc(
             ease(currentTime, animateFrom, changeInValue, animationDuration),