diff --git a/lib/OpenLayers/Util.js b/lib/OpenLayers/Util.js
index fe9f49ac84..fc61a34828 100644
--- a/lib/OpenLayers/Util.js
+++ b/lib/OpenLayers/Util.js
@@ -1714,7 +1714,8 @@ OpenLayers.Util.requestAnimationFrame = (function() {
     var loops = {};
     var request = OpenLayers.Util.requestAnimationFrame;
     
-    OpenLayers.Util.loopAnimation = function(duration, callback, element) {
+    OpenLayers.Util.loopAnimation = function(callback, duration, element) {
+        duration = duration > 0 ? duration : Number.POSITIVE_INFINITY;
         var id = ++counter;
         var start = +new Date;
         loops[id] = function() {