diff --git a/Loader/SymfonyFixturesLoader.php b/Loader/SymfonyFixturesLoader.php
index 5489ca1d..77d0e219 100644
--- a/Loader/SymfonyFixturesLoader.php
+++ b/Loader/SymfonyFixturesLoader.php
@@ -31,7 +31,7 @@ final class SymfonyFixturesLoader extends ContainerAwareLoader implements Symfon
      *
      * @param array $fixtures
      */
-    public function addFixtures(array $fixtures)
+    public function addFixtures(array $fixtures): void
     {
         // Because parent::addFixture may call $this->createFixture
         // we cannot call $this->addFixture in this loop
@@ -48,7 +48,7 @@ public function addFixtures(array $fixtures)
         }
     }
 
-    public function addFixture(FixtureInterface $fixture)
+    public function addFixture(FixtureInterface $fixture): void
     {
         $class                        = get_class($fixture);
         $this->loadedFixtures[$class] = $fixture;
diff --git a/ManagerConfigurator.php b/ManagerConfigurator.php
index 19385988..a338929c 100644
--- a/ManagerConfigurator.php
+++ b/ManagerConfigurator.php
@@ -36,10 +36,8 @@ public function configure(DocumentManager $documentManager)
 
     /**
      * Enable filters for an given document manager
-     *
-     * @return null
      */
-    private function enableFilters(DocumentManager $documentManager)
+    private function enableFilters(DocumentManager $documentManager): void
     {
         if (empty($this->enabledFilters)) {
             return;