diff --git a/src/Symfony/SymfonyLoggingBundle.php b/src/Symfony/SymfonyLoggingBundle.php
index f8072b2..acbb08b 100644
--- a/src/Symfony/SymfonyLoggingBundle.php
+++ b/src/Symfony/SymfonyLoggingBundle.php
@@ -9,7 +9,7 @@
 
 class SymfonyLoggingBundle extends Bundle
 {
-    public function build(ContainerBuilder $container)
+    public function build(ContainerBuilder $container): void
     {
         parent::build($container);