diff --git a/src/Symfony/Contracts/EventDispatcher/EventDispatcherInterface.php b/src/Symfony/Contracts/EventDispatcher/EventDispatcherInterface.php
index 2d470af92006c..46e2a82c388e2 100644
--- a/src/Symfony/Contracts/EventDispatcher/EventDispatcherInterface.php
+++ b/src/Symfony/Contracts/EventDispatcher/EventDispatcherInterface.php
@@ -32,7 +32,7 @@ interface EventDispatcherInterface extends PsrEventDispatcherInterface
          *
          * @return object The passed $event MUST be returned
          */
-        public function dispatch($event/*, string $eventName = null*/);
+        public function dispatch(object $event/*, string $eventName = null*/);
     }
 } else {
     /**