diff --git a/Foundation/CPDictionary.j b/Foundation/CPDictionary.j
index f0db3cfa1..28e7a1310 100755
--- a/Foundation/CPDictionary.j
+++ b/Foundation/CPDictionary.j
@@ -154,7 +154,7 @@
 
         var value = object[key];
         
-        if (value == null)
+        if (value === null)
         {
             [dictionary setObject:[CPNull null] forKey:key];
             continue;