diff --git a/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/di/DependencyInjection.xtend b/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/di/DependencyInjection.xtend
index 5c4d90d73..b1a2890f0 100644
--- a/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/di/DependencyInjection.xtend
+++ b/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/di/DependencyInjection.xtend
@@ -90,7 +90,7 @@ class DependencyInjection {
          */
         abstract class Abstract«vendor.formatForCodeCapital»«name.formatForCodeCapital»Extension extends Extension
         {
-            public function load(array $configs, ContainerBuilder $container)
+            public function load(array $configs, ContainerBuilder $container): void
             {
                 $loader = new YamlFileLoader($container, new FileLocator(__DIR__ . '/../../Resources/config'));
                 $loader->load('services.yaml');