diff --git a/auquotidien/modules/payments.py b/auquotidien/modules/payments.py
index 941f2d2..3026ef0 100644
--- a/auquotidien/modules/payments.py
+++ b/auquotidien/modules/payments.py
@@ -33,7 +33,6 @@ from wcs.qommon.misc import simplify
 from wcs.formdef import FormDef
 from wcs.formdata import Evolution
 from wcs.workflows import WorkflowStatusItem, register_item_class, template_on_formdata
-from wcs.users import User
 
 def is_payment_supported():
     if not eopayment:
@@ -85,7 +84,7 @@ class Invoice(StorableObject):
 
     def get_user(self):
         if self.user_id:
-            return User.get(self.user_id, ignore_errors=True)
+            return get_publisher().user_class.get(self.user_id, ignore_errors=True)
         return None
 
     @property