diff --git a/wiki/web/user.py b/wiki/web/user.py
index 282ecac..3b58167 100644
--- a/wiki/web/user.py
+++ b/wiki/web/user.py
@@ -143,6 +143,6 @@ def protect(f):
     @wraps(f)
     def wrapper(*args, **kwargs):
         if current_app.config.get('PRIVATE') and not current_user.is_authenticated():
-            return loginmanager.unauthorized()
+            return current_app.login_manager.unauthorized()
         return f(*args, **kwargs)
     return wrapper