diff --git a/modoboa/lib/parameters.py b/modoboa/lib/parameters.py
index 7dd2998ab..8e1671ea8 100644
--- a/modoboa/lib/parameters.py
+++ b/modoboa/lib/parameters.py
@@ -257,7 +257,7 @@ def get_admin(name, app=None, raise_error=True):
     return p.value.decode("unicode_escape")
 
 
-def get_user(user, name, app=None):
+def get_user(user, name, app=None, raise_error=True):
     """Return a parameter for a specific user
 
     A ``NotDefined`` exception if the parameter doesn't exist.