diff --git a/src/effects.js b/src/effects.js
index 9835e959..727c1a7a 100644
--- a/src/effects.js
+++ b/src/effects.js
@@ -12,7 +12,9 @@ var elemdisplay = {},
 		// opacity animations
 		[ "opacity" ]
 	],
-	requestAnimationFrame = window.webkitRequestAnimationFrame || window.mozRequestionAnimationFrame;
+	requestAnimationFrame = window.webkitRequestAnimationFrame ||
+	    window.mozRequestAnimationFrame ||
+	    window.oRequestAnimationFrame;
 
 jQuery.fn.extend({
 	show: function( speed, easing, callback ) {