diff --git a/src/redturtle/volto/monkey.py b/src/redturtle/volto/monkey.py
index ad053948..dae8073c 100644
--- a/src/redturtle/volto/monkey.py
+++ b/src/redturtle/volto/monkey.py
@@ -130,5 +130,5 @@ def getPotentialMembers(self, searchString):
     form = self.request.form
     findAll = form.get("form.button.FindAll", None) is not None and not self.many_users
     if findAll or searchString:
-        return self._old__getPotentialMembers(searchString)
+        return self._old_getPotentialMembers(searchString)
     return []