diff --git a/Command/ExportTranslationsCommand.php b/Command/ExportTranslationsCommand.php
index c97958c7..a5045f44 100644
--- a/Command/ExportTranslationsCommand.php
+++ b/Command/ExportTranslationsCommand.php
@@ -35,7 +35,7 @@ public function __construct(
     /**
      * {@inheritdoc}
      */
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('lexik:translations:export');
         $this->setDescription('Export translations from the database to files.');
diff --git a/Command/ImportTranslationsCommand.php b/Command/ImportTranslationsCommand.php
index 14ea54ea..60cfbd67 100644
--- a/Command/ImportTranslationsCommand.php
+++ b/Command/ImportTranslationsCommand.php
@@ -46,7 +46,7 @@ public function __construct(
     /**
      * {@inheritdoc}
      */
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('lexik:translations:import');
         $this->setDescription('Import all translations from flat files (xliff, yml, php) into the database.');
diff --git a/LexikTranslationBundle.php b/LexikTranslationBundle.php
index 9fa6aee6..80b92d42 100644
--- a/LexikTranslationBundle.php
+++ b/LexikTranslationBundle.php
@@ -14,7 +14,7 @@
  */
 class LexikTranslationBundle extends Bundle
 {
-    public function build(ContainerBuilder $container)
+    public function build(ContainerBuilder $container): void
     {
         parent::build($container);