diff --git a/product/ERP5Type/patches/ExternalMethod.py b/product/ERP5Type/patches/ExternalMethod.py
index 2ae8a751c168340e1c684de1d3c16ddea5a82b9e..c76685eadaef266e2c63ee2984ed15152610209f 100644
--- a/product/ERP5Type/patches/ExternalMethod.py
+++ b/product/ERP5Type/patches/ExternalMethod.py
@@ -42,7 +42,6 @@ if 1:
 
     ExternalMethod.getFunction = getFunction
 
-    ExternalMethod__call__ = ExternalMethod.__call__
     def __call__(self, *args, **kw):
         """Call an ExternalMethod