diff --git a/lib/ClassBuilder.js b/lib/ClassBuilder.js
index 71005be..f5f2ec1 100644
--- a/lib/ClassBuilder.js
+++ b/lib/ClassBuilder.js
@@ -603,7 +603,7 @@ exports.prototype.createConcreteCtor = function( cname, members )
     // constructor function to be returned (the name is set to ClassInstance
     // because some debuggers (e.g. v8) will show the name of this function for
     // constructor instances rather than invoking the toString() method)
-    var ClassInstance = function ClassInstance()
+    function ClassInstance()
     {
         if ( !( this instanceof ClassInstance ) )
         {