diff --git a/lib/open_project/authentication/manager.rb b/lib/open_project/authentication/manager.rb
index 3fd7fd80ec..d83e3b74cf 100644
--- a/lib/open_project/authentication/manager.rb
+++ b/lib/open_project/authentication/manager.rb
@@ -30,7 +30,7 @@ module OpenProject
 
         def configure(config)
           config.default_strategies :session
-          config.failure_app = OpenProject::Authentication::FailureApp
+          config.failure_app = OpenProject::Authentication::FailureApp.new
 
           scope_strategies.each do |scope, strategies|
             config.scope_defaults scope, strategies: strategies, store: store_defaults[scope]