diff --git a/Tools/bgen/bgen/bgenGenerator.py b/Tools/bgen/bgen/bgenGenerator.py
index e364d01..f554fe2 100644
--- a/Tools/bgen/bgen/bgenGenerator.py
+++ b/Tools/bgen/bgen/bgenGenerator.py
@@ -68,7 +68,7 @@
         if self.condition:
             Output()
             Output(self.condition)
-        Output("{\"%s\", (PyCFunction)%s_%s, 1,", name, self.prefix, self.name)
+        Output("{\"%s\", (PyCFunction)%s_%s, METH_VARARGS,", name, self.prefix, self.name)
         Output(" PyDoc_STR(%s)},", stringify(docstring))
         if self.condition:
             Output("#endif")