diff --git a/src/Symfony/Bridge/Monolog/Handler/SwiftMailerHandler.php b/src/Symfony/Bridge/Monolog/Handler/SwiftMailerHandler.php
index 85b3c9229e46..f255f0a83ed1 100644
--- a/src/Symfony/Bridge/Monolog/Handler/SwiftMailerHandler.php
+++ b/src/Symfony/Bridge/Monolog/Handler/SwiftMailerHandler.php
@@ -63,10 +63,8 @@ protected function send($content, array $records): void
 
     /**
      * {@inheritdoc}
-     *
-     * @return void
      */
-    public function reset()
+    public function reset(): void
     {
         $this->flushMemorySpool();
     }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Test/TestContainer.php b/src/Symfony/Bundle/FrameworkBundle/Test/TestContainer.php
index 3fe688aa3fd3..78a692b2c4b7 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Test/TestContainer.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Test/TestContainer.php
@@ -98,7 +98,7 @@ public function has($id): bool
     /**
      * {@inheritdoc}
      */
-    public function get($id, int $invalidBehavior = /* self::EXCEPTION_ON_INVALID_REFERENCE */ 1)
+    public function get($id, int $invalidBehavior = /* self::EXCEPTION_ON_INVALID_REFERENCE */ 1): ?object
     {
         return $this->getPrivateContainer()->has($id) ? $this->getPrivateContainer()->get($id) : $this->getPublicContainer()->get($id, $invalidBehavior);
     }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/AbstractControllerTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/AbstractControllerTest.php
index 327c66a86b90..3936daaf241a 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/AbstractControllerTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/AbstractControllerTest.php
@@ -159,10 +159,8 @@ public function testGetUserWithEmptyContainer()
 
     /**
      * @param $token
-     *
-     * @return Container
      */
-    private function getContainerWithTokenStorage($token = null)
+    private function getContainerWithTokenStorage($token = null): Container
     {
         $tokenStorage = $this->getMockBuilder('Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorage')->getMock();
         $tokenStorage
diff --git a/src/Symfony/Component/Cache/Adapter/MemcachedAdapter.php b/src/Symfony/Component/Cache/Adapter/MemcachedAdapter.php
index c0d8bba435f0..6ba16297fed9 100644
--- a/src/Symfony/Component/Cache/Adapter/MemcachedAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/MemcachedAdapter.php
@@ -316,10 +316,7 @@ private function checkResultCode($result)
         throw new CacheException(sprintf('MemcachedAdapter client error: %s.', strtolower($this->client->getResultMessage())));
     }
 
-    /**
-     * @return \Memcached
-     */
-    private function getClient()
+    private function getClient(): \Memcached
     {
         if ($this->client) {
             return $this->client;
diff --git a/src/Symfony/Component/DomCrawler/Crawler.php b/src/Symfony/Component/DomCrawler/Crawler.php
index c9b7ab163415..c6f41e070b6d 100644
--- a/src/Symfony/Component/DomCrawler/Crawler.php
+++ b/src/Symfony/Component/DomCrawler/Crawler.php
@@ -898,7 +898,7 @@ public static function xpathLiteral(string $s)
      *
      * @return static
      */
-    private function filterRelativeXPath(string $xpath)
+    private function filterRelativeXPath(string $xpath): object
     {
         $prefixes = $this->findNamespacePrefixes($xpath);
 
@@ -1140,7 +1140,7 @@ private function findNamespacePrefixes(string $xpath): array
      *
      * @return static
      */
-    private function createSubCrawler($nodes)
+    private function createSubCrawler($nodes): object
     {
         $crawler = new static($nodes, $this->uri, $this->baseHref);
         $crawler->isHtml = $this->isHtml;
diff --git a/src/Symfony/Component/HttpKernel/EventListener/AbstractSessionListener.php b/src/Symfony/Component/HttpKernel/EventListener/AbstractSessionListener.php
index 753310a5d012..d1d3314b117c 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/AbstractSessionListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/AbstractSessionListener.php
@@ -128,7 +128,7 @@ public function onFinishRequest(FinishRequestEvent $event)
         }
     }
 
-    public static function getSubscribedEvents()
+    public static function getSubscribedEvents(): array
     {
         return [
             KernelEvents::REQUEST => ['onKernelRequest', 128],
diff --git a/src/Symfony/Component/HttpKernel/EventListener/AbstractTestSessionListener.php b/src/Symfony/Component/HttpKernel/EventListener/AbstractTestSessionListener.php
index fa1e8a5fdafa..19d13b8c4674 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/AbstractTestSessionListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/AbstractTestSessionListener.php
@@ -97,7 +97,7 @@ public function onKernelResponse(ResponseEvent $event)
         }
     }
 
-    public static function getSubscribedEvents()
+    public static function getSubscribedEvents(): array
     {
         return [
             KernelEvents::REQUEST => ['onKernelRequest', 192],
diff --git a/src/Symfony/Component/Mime/Email.php b/src/Symfony/Component/Mime/Email.php
index dace1cfc35eb..166dd819ea56 100644
--- a/src/Symfony/Component/Mime/Email.php
+++ b/src/Symfony/Component/Mime/Email.php
@@ -515,7 +515,7 @@ private function createDataPart(array $attachment): DataPart
     /**
      * @return $this
      */
-    private function setHeaderBody(string $type, string $name, $body)
+    private function setHeaderBody(string $type, string $name, $body): object
     {
         $this->getHeaders()->setHeaderBody($type, $name, $body);
 
diff --git a/src/Symfony/Component/Translation/Translator.php b/src/Symfony/Component/Translation/Translator.php
index 5c1b7c00763b..65f0f3aca2ce 100644
--- a/src/Symfony/Component/Translation/Translator.php
+++ b/src/Symfony/Component/Translation/Translator.php
@@ -180,10 +180,8 @@ public function setFallbackLocales(array $locales)
      * Gets the fallback locales.
      *
      * @internal
-     *
-     * @return array The fallback locales
      */
-    public function getFallbackLocales()
+    public function getFallbackLocales(): array
     {
         return $this->fallbackLocales;
     }