diff --git a/Foundation/CPNumber.j b/Foundation/CPNumber.j
index 9bf54323c..33bcb73ac 100644
--- a/Foundation/CPNumber.j
+++ b/Foundation/CPNumber.j
@@ -50,7 +50,7 @@ var CPNumberUIDs    = new CFMutableDictionary();
 
 + (id)numberWithBool:(BOOL)aBoolean
 {
-    return aBoolean;
+    return aBoolean ? 1 : 0;
 }
 
 + (id)numberWithChar:(char)aChar