diff --git a/AutoMapperPlusBundle.php b/AutoMapperPlusBundle.php
index 821286f..f4b744b 100644
--- a/AutoMapperPlusBundle.php
+++ b/AutoMapperPlusBundle.php
@@ -16,7 +16,7 @@ class AutoMapperPlusBundle extends Bundle
     /**
      * @inheritdoc
      */
-    public function build(ContainerBuilder $container)
+    public function build(ContainerBuilder $container): void
     {
         parent::build($container);
         $container->addCompilerPass(new ConfigurationLoaderPass());