diff --git a/src/util.js b/src/util.js
index 41ae4cc96..4fb96f062 100644
--- a/src/util.js
+++ b/src/util.js
@@ -261,7 +261,7 @@ var Promise = (function promise() {
       this.data = data;
       var callbacks = this.callbacks;
 
-      for (var i = 0; i < callbacks.length; i++) {
+      for (var i = 0, ii = callbacks.length; i < ii; i++) {
         callbacks[i].call(null, data);
       }
     },
diff --git a/src/worker.js b/src/worker.js
index d62e0c86b..9860ef978 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -75,7 +75,7 @@ var WorkerProcessorHandler = {
 
       // Filter the dependecies for fonts.
       var fonts = {};
-      for (var i = 0; i < dependency.length; i++) {
+      for (var i = 0, ii = dependency.length; i < ii; i++) {
         var dep = dependency[i];
         if (dep.indexOf('font_') == 0) {
           fonts[dep] = true;