diff --git a/aodh/api/rbac.py b/aodh/api/rbac.py
index e13925e7..7b592b07 100644
--- a/aodh/api/rbac.py
+++ b/aodh/api/rbac.py
@@ -100,6 +100,7 @@ def get_limited_to_project(headers, enforcer):
     """Return the project the request should be limited to.
 
     :param headers: HTTP headers dictionary
+    :param enforcer: policy enforcer
     :return: A project, or None if there's no limit on it.
 
     """