diff --git a/Foundation/CPArray/_CPArray.j b/Foundation/CPArray/_CPArray.j
index ba2e0cd9f..5ba2124ba 100755
--- a/Foundation/CPArray/_CPArray.j
+++ b/Foundation/CPArray/_CPArray.j
@@ -208,6 +208,14 @@ var concat = Array.prototype.concat,
     _CPRaiseInvalidAbstractInvocation(self, _cmd);
 }
 
+/*!
+Returns a hash for the object. Unlike Cocoa, the hash value does not take content into account, so two arrays with the same content (\c isEqual: === YES) will not generate the same hash.
+*/
+- (unsigned)hash
+{
+    return [self UID];
+}
+
 /*!
     Returns the first object in the array. If the array is empty, returns \c nil
 */