diff --git a/lib/propmangle.js b/lib/propmangle.js
index 27df236f4..9a94781b8 100644
--- a/lib/propmangle.js
+++ b/lib/propmangle.js
@@ -78,7 +78,7 @@ function find_builtins(reserved) {
     var global_ref = typeof global === "object" ? global : self;
 
     new_globals.forEach(function (new_global) {
-        objects[new_global] = global_ref[new_global] || new Function();
+        objects[new_global] = global_ref[new_global] || function() {};
     });
 
     [