diff --git a/OldSoundRabbitMqBundle.php b/OldSoundRabbitMqBundle.php
index d9725163..8ed4223f 100644
--- a/OldSoundRabbitMqBundle.php
+++ b/OldSoundRabbitMqBundle.php
@@ -9,7 +9,7 @@
 
 class OldSoundRabbitMqBundle extends Bundle
 {
-    public function build(ContainerBuilder $container)
+    public function build(ContainerBuilder $container): void
     {
         parent::build($container);
 
@@ -20,7 +20,7 @@ public function build(ContainerBuilder $container)
     /**
      * {@inheritDoc}
      */
-    public function shutdown()
+    public function shutdown(): void
     {
         parent::shutdown();
         if (!$this->container->hasParameter('old_sound_rabbit_mq.base_amqp')) {