diff --git a/src/core/math/shapes/Polygon.js b/src/core/math/shapes/Polygon.js
index 636456b..29797b8 100644
--- a/src/core/math/shapes/Polygon.js
+++ b/src/core/math/shapes/Polygon.js
@@ -23,8 +23,8 @@
         // see section 3.2: https://github.com/petkaantonov/bluebird/wiki/Optimization-killers#3-managing-arguments
         points = new Array(arguments.length);
 
-        for (var i = 0; i < points.length; ++i) {
-            points[i] = arguments[i];
+        for (var a = 0; a < points.length; ++a) {
+            points[a] = arguments[a];
         }
     }
 

diff --git a/src/core/math/shapes/Polygon.js b/src/core/math/shapes/Polygon.js
index 636456b..29797b8 100644
--- a/src/core/math/shapes/Polygon.js
+++ b/src/core/math/shapes/Polygon.js
@@ -23,8 +23,8 @@
         // see section 3.2: https://github.com/petkaantonov/bluebird/wiki/Optimization-killers#3-managing-arguments
         points = new Array(arguments.length);
 
-        for (var i = 0; i < points.length; ++i) {
-            points[i] = arguments[i];
+        for (var a = 0; a < points.length; ++a) {
+            points[a] = arguments[a];
         }
     }
 
diff --git a/src/core/utils/index.js b/src/core/utils/index.js
index 81190cd..4797106 100644
--- a/src/core/utils/index.js
+++ b/src/core/utils/index.js
@@ -222,7 +222,7 @@
         {
             return false;
         }
-    }
+    },
 
     TextureCache: {},
     BaseTextureCache: {}

diff --git a/src/core/math/shapes/Polygon.js b/src/core/math/shapes/Polygon.js
index 636456b..29797b8 100644
--- a/src/core/math/shapes/Polygon.js
+++ b/src/core/math/shapes/Polygon.js
@@ -23,8 +23,8 @@
         // see section 3.2: https://github.com/petkaantonov/bluebird/wiki/Optimization-killers#3-managing-arguments
         points = new Array(arguments.length);
 
-        for (var i = 0; i < points.length; ++i) {
-            points[i] = arguments[i];
+        for (var a = 0; a < points.length; ++a) {
+            points[a] = arguments[a];
         }
     }
 
diff --git a/src/core/utils/index.js b/src/core/utils/index.js
index 81190cd..4797106 100644
--- a/src/core/utils/index.js
+++ b/src/core/utils/index.js
@@ -222,7 +222,7 @@
         {
             return false;
         }
-    }
+    },
 
     TextureCache: {},
     BaseTextureCache: {}
diff --git a/src/interaction/InteractionManager.js b/src/interaction/InteractionManager.js
index 6874701..242acf3 100644
--- a/src/interaction/InteractionManager.js
+++ b/src/interaction/InteractionManager.js
@@ -670,7 +670,7 @@
 
     for (var i=0; i < cLength; i++)
     {
-        touchEvent = changedTouches[i];
+        var touchEvent = changedTouches[i];
 
         var touchData = this.getTouchData( touchEvent );
 
@@ -734,7 +734,7 @@
 
     for (var i=0; i < cLength; i++)
     {
-        touchEvent = changedTouches[i];
+        var touchEvent = changedTouches[i];
 
         var touchData = this.getTouchData( touchEvent );