diff --git a/lib/class_builder.js b/lib/class_builder.js
index 0b98551..5bb5dfa 100644
--- a/lib/class_builder.js
+++ b/lib/class_builder.js
@@ -192,8 +192,7 @@ exports.build = function extend()
         base,
         prop_init,
         abstract_methods,
-        members,
-        getMethodInstance
+        members
     );
 
     // reference to the parent prototype (for more experienced users)
@@ -372,8 +371,7 @@ function createAbstractCtor( cname )
 
 
 function buildMembers(
-    props, class_id, base, prop_init, abstract_methods, members,
-    getMethodInstance
+    props, class_id, base, prop_init, abstract_methods, members
 )
 {
     var hasOwn = Array.prototype.hasOwnProperty,