diff --git a/actionpack/lib/action_dispatch/testing/integration.rb b/actionpack/lib/action_dispatch/testing/integration.rb
index e0a17130f8..8fe74c3c80 100644
--- a/actionpack/lib/action_dispatch/testing/integration.rb
+++ b/actionpack/lib/action_dispatch/testing/integration.rb
@@ -364,7 +364,7 @@ module ActionDispatch
       end
 
       def respond_to?(method, include_private = false)
-        @integration_session.respond_to?(method, include_private) || super
+        integration_session.respond_to?(method, include_private) || super
       end
 
       # Delegate unhandled messages to the current session instance.