diff --git a/src/DependencyInjection/NutgramExtension.php b/src/DependencyInjection/NutgramExtension.php
index 172aea9..7ec1a93 100644
--- a/src/DependencyInjection/NutgramExtension.php
+++ b/src/DependencyInjection/NutgramExtension.php
@@ -9,7 +9,7 @@
 
 class NutgramExtension extends Extension
 {
-    public function load(array $configs, ContainerBuilder $container)
+    public function load(array $configs, ContainerBuilder $container): void
     {
         $configuration = new Configuration();