diff --git a/src/body/Composite.js b/src/body/Composite.js
index 06fc6ef..f91b4f2 100644
--- a/src/body/Composite.js
+++ b/src/body/Composite.js
@@ -166,7 +166,7 @@ var Composite = {};
      * @return {composite} The original compositeA with the composite removed
      */
     Composite.removeComposite = function(compositeA, compositeB, deep) {
-        var position = compositeA.composites.indexOf(compositeB);
+        var position = Common.indexOf(compositeA.composites, compositeB);
         if (position !== -1) {
             Composite.removeCompositeAt(compositeA, position);
             Composite.setModified(compositeA, true, true, false);
@@ -219,7 +219,7 @@ var Composite = {};
      * @return {composite} The original composite with the body removed
      */
     Composite.removeBody = function(composite, body, deep) {
-        var position = composite.bodies.indexOf(body);
+        var position = Common.indexOf(composite.bodies, body);
         if (position !== -1) {
             Composite.removeBodyAt(composite, position);
             Composite.setModified(composite, true, true, false);
@@ -272,7 +272,7 @@ var Composite = {};
      * @return {composite} The original composite with the constraint removed
      */
     Composite.removeConstraint = function(composite, constraint, deep) {
-        var position = composite.constraints.indexOf(constraint);
+        var position = Common.indexOf(composite.constraints, constraint);
         if (position !== -1) {
             Composite.removeConstraintAt(composite, position);
         }
diff --git a/src/collision/Grid.js b/src/collision/Grid.js
index 4d7ace1..7b5ad17 100644
--- a/src/collision/Grid.js
+++ b/src/collision/Grid.js
@@ -247,7 +247,7 @@ var Grid = {};
      */
     var _bucketRemoveBody = function(grid, bucket, body) {
         // remove from bucket
-        bucket.splice(bucket.indexOf(body), 1);
+        bucket.splice(Common.indexOf(bucket, body), 1);
 
         // update pair counts
         for (var i = 0; i < bucket.length; i++) {
diff --git a/src/collision/Pairs.js b/src/collision/Pairs.js
index 61999d6..d74c5ec 100644
--- a/src/collision/Pairs.js
+++ b/src/collision/Pairs.js
@@ -85,7 +85,7 @@ var Pairs = {};
         // deactivate previously active pairs that are now inactive
         for (i = 0; i < pairsList.length; i++) {
             pair = pairsList[i];
-            if (pair.isActive && activePairIds.indexOf(pair.id) === -1) {
+            if (pair.isActive && Common.indexOf(activePairIds, pair.id) === -1) {
                 Pair.setActive(pair, false, timestamp);
                 collisionEnd.push(pair);
             }
diff --git a/src/core/Common.js b/src/core/Common.js
index 8b7a29a..fbd4c27 100644
--- a/src/core/Common.js
+++ b/src/core/Common.js
@@ -281,6 +281,24 @@ var Common = {};
         return Common._nextId++;
     };
 
+    /**
+     * A cross browser compatible indexOf implementation
+     * @method indexOf
+     * @param {array} haystack
+     * @param {object} needle
+     */
+    Common.indexOf = function(haystack, needle) {
+        if (haystack.indexOf)
+            return haystack.indexOf(needle);
+
+        for (var i = 0; i < haystack.length; i++) {
+            if (haystack[i] === needle)
+                return i;
+        }
+
+        return -1;
+    };
+
     var _seededRandom = function() {
         // https://gist.github.com/ngryman/3830489
         Common._seed = (Common._seed * 9301 + 49297) % 233280;
diff --git a/src/render/RenderPixi.js b/src/render/RenderPixi.js
index 2dd1ca3..6bf6c1d 100644
--- a/src/render/RenderPixi.js
+++ b/src/render/RenderPixi.js
@@ -261,7 +261,7 @@ var RenderPixi = {};
         }
 
         // add to scene graph if not already there
-        if (container.children.indexOf(primitive) === -1)
+        if (Common.indexOf(container.children, primitive) === -1)
             container.addChild(primitive);
 
         // render the constraint on every update, since they can change dynamically
@@ -307,7 +307,7 @@ var RenderPixi = {};
                 sprite = render.sprites[spriteId] = _createBodySprite(render, body);
 
             // add to scene graph if not already there
-            if (spriteBatch.children.indexOf(sprite) === -1)
+            if (Common.indexOf(spriteBatch.children, sprite) === -1)
                 spriteBatch.addChild(sprite);
 
             // update body sprite
@@ -326,7 +326,7 @@ var RenderPixi = {};
             }
 
             // add to scene graph if not already there
-            if (container.children.indexOf(primitive) === -1)
+            if (Common.indexOf(container.children, primitive) === -1)
                 container.addChild(primitive);
 
             // update body primitive