diff --git a/core/lib/Drupal/Core/Config/ConfigCrudEvent.php b/core/lib/Drupal/Core/Config/ConfigCrudEvent.php
index cad44df..112d7e0 100644
--- a/core/lib/Drupal/Core/Config/ConfigCrudEvent.php
+++ b/core/lib/Drupal/Core/Config/ConfigCrudEvent.php
@@ -12,7 +12,7 @@
 /**
  * Wraps a configuration event for event listeners.
  */
-class ConfigCrudEvent extends Event implements ConfigEventInterface {
+class ConfigCrudEvent extends Event {
 
   /**
    * Configuration object.
@@ -32,14 +32,22 @@ public function __construct(Config $config) {
   }
 
   /**
-   * {@inheritdoc}
+   * Gets configuration object.
+   *
+   * @return \Drupal\Core\Config\Config
+   *   The configuration object that caused the event to fire.
    */
   public function getConfig() {
     return $this->config;
   }
 
   /**
-   * {@inheritdoc}
+   * Checks to see if the provided configuration key's value has changed.
+   *
+   * @param string $key
+   *   The configuration key to check if it has changed.
+   *
+   * @return bool
    */
   public function changed($key) {
     return $this->config->get($key) !== $this->config->getOriginal($key);
diff --git a/core/lib/Drupal/Core/Config/ConfigEventInterface.php b/core/lib/Drupal/Core/Config/ConfigEventInterface.php
deleted file mode 100644
index 094df91..0000000
--- a/core/lib/Drupal/Core/Config/ConfigEventInterface.php
+++ /dev/null
@@ -1,32 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\Core\Config\ConfigEventInterface.
- */
-
-namespace Drupal\Core\Config;
-
-/**
- * Defines a common interface for configuration events.
- */
-interface ConfigEventInterface {
-
-  /**
-   * Gets configuration object.
-   *
-   * @return \Drupal\Core\Config\Config
-   *   The configuration object that caused the event to fire.
-   */
-  public function getConfig();
-
-  /**
-   * Checks to see if the provided configuration key's value has changed.
-   *
-   * @param string $key
-   *   The configuration key to check if it has changed.
-   *
-   * @return bool
-   */
-  public function changed($key);
-}