diff --git a/core/lib/Drupal/Core/Config/ConfigBase.php b/core/lib/Drupal/Core/Config/ConfigBase.php
index e4d298511599eeabfab91f6c8c71dccf964f7708..744af363b157b633f7063004207b4f5aa14c499d 100644
--- a/core/lib/Drupal/Core/Config/ConfigBase.php
+++ b/core/lib/Drupal/Core/Config/ConfigBase.php
@@ -200,8 +200,6 @@ public function set($key, $value) {
    * @param array $data
    *   Configuration array structure.
    *
-   * @return null
-   *
    * @throws \Drupal\Core\Config\ConfigValueException
    *   If any key in $data in any depth contains a dot.
    */
diff --git a/core/lib/Drupal/Core/Config/StorableConfigBase.php b/core/lib/Drupal/Core/Config/StorableConfigBase.php
index f3202a764441f6e0f23af3c445b40bccea454f45..ae521919d00a507200e9de28a39371907ef1a622 100644
--- a/core/lib/Drupal/Core/Config/StorableConfigBase.php
+++ b/core/lib/Drupal/Core/Config/StorableConfigBase.php
@@ -145,8 +145,6 @@ protected function getSchemaWrapper() {
    * @param mixed $value
    *   Value to associate with the key.
    *
-   * @return null
-   *
    * @throws \Drupal\Core\Config\UnsupportedDataTypeConfigException
    *   If the value is unsupported in configuration.
    */
diff --git a/core/tests/Drupal/Tests/Core/DrupalKernel/DrupalKernelTest.php b/core/tests/Drupal/Tests/Core/DrupalKernel/DrupalKernelTest.php
index 4efda0785bfc33bb289b8fc1e7839cdf91d9d533..cb04af7ff54405ba7b4e0fa36671f5202a2d61b5 100644
--- a/core/tests/Drupal/Tests/Core/DrupalKernel/DrupalKernelTest.php
+++ b/core/tests/Drupal/Tests/Core/DrupalKernel/DrupalKernelTest.php
@@ -177,8 +177,7 @@ public function unregister() {
   /**
    * Loads the given class or interface.
    *
-   * @return null
-   *   This class never loads.
+   * This class never loads.
    */
   public function loadClass() {
     return NULL;
@@ -187,8 +186,7 @@ public function loadClass() {
   /**
    * Finds a file by class name while caching lookups to APC.
    *
-   * @return null
-   *   This class never finds.
+   * This class never finds.
    */
   public function findFile() {
     return NULL;