diff --git a/sauth/json_backend.py b/sauth/json_backend.py
index c8b5b67..d1dc8ad 100644
--- a/sauth/json_backend.py
+++ b/sauth/json_backend.py
@@ -69,7 +69,7 @@ class JsonBackend:
     def rm_user(self, username):
         if username in self._json_users :
             del self._json_users[username]
-            self._update_json_roles()
+            self._update_json()
             return True
         return False