diff --git a/Foundation/CPArray/_CPJavaScriptArray.j b/Foundation/CPArray/_CPJavaScriptArray.j
index edd1292e6..e1fb6b2ac 100644
--- a/Foundation/CPArray/_CPJavaScriptArray.j
+++ b/Foundation/CPArray/_CPJavaScriptArray.j
@@ -248,14 +248,19 @@ var concat = Array.prototype.concat,
 
 - (void)removeObjectIdenticalTo:(id)anObject
 {
-    var anIndex = indexOf.call(self, anObject);
-    if (anIndex !== -1)
-        splice.call(self, anIndex, 1);
+    if (indexOf)
+    {
+        var anIndex;
+        if ((anIndex = indexOf.call(self, anObject)) !== -1)
+            splice.call(self, anIndex, 1);
+    }
+    else
+        [super removeObjectIdenticalTo:anObject inRange:CPMakeRange(0, self.length)];
 }
 
 - (void)removeObjectIdenticalTo:(id)anObject inRange:(CPRange)aRange
 {
-    if (!aRange)
+    if (indexOf && !aRange)
         [self removeObjectIdenticalTo:anObject];
 
     [super removeObjectIdenticalTo:anObject inRange:aRange];