diff --git a/actionpack/lib/action_dispatch/testing/integration.rb b/actionpack/lib/action_dispatch/testing/integration.rb
index 4d25bb8d7b090066e1e90f5e789476a8c2f9be07..fee8cad9f50130c6de8e81a0b82c74319935f62f 100644
--- a/actionpack/lib/action_dispatch/testing/integration.rb
+++ b/actionpack/lib/action_dispatch/testing/integration.rb
@@ -171,7 +171,7 @@ def cookies
 
       # Create and initialize a new Session instance.
       def initialize(app)
-        super
+        super()
         @app = app
 
         # If the app is a Rails app, make url_helpers available on the session