diff --git a/core/lib/Drupal/Core/Config/Config.php b/core/lib/Drupal/Core/Config/Config.php
index 6fc2a87..8e1c332 100644
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -13,7 +13,7 @@
 /**
  * Defines the default configuration object.
  */
-class Config {
+class Config implements ArrayAccess{
 
   /**
    * The name of the configuration object.
@@ -416,4 +416,54 @@ public function merge(array $data_to_merge) {
     $this->data = NestedArray::mergeDeepArray(array($this->data, $data_to_merge), TRUE);
     return $this;
   }
+
+  /* ArrayAccess Aliases */
+
+  /**
+   * Implements ArrayAccess::offsetExists.
+   *
+   * Allows you to do this:
+   * @code
+   * isset($config['foo']);
+   * @endcode
+   */
+  public function offsetExists($name) {
+    $this->get()->isset($name);
+  }
+
+  /**
+   * Implements ArrayAccess::offsetGet.
+   *
+   * Alias of DrupalConfig::get. Allows you to do this:
+   * @code
+   * $value = $config['foo'];
+   * @endcode
+   */
+  public function offsetGet($name){
+    return $this->get($name);
+  }
+
+  /**
+   * Implements ArrayAccess::offsetSet.
+   *
+   * Alias of DrupalConfig::set. Allows you to do this:
+   * @code
+   * $config['foo'] = 'bar';
+   * @endcode
+   */
+  public function offsetSet($name, $value){
+    return $this->set($name, $value);
+  }
+
+  /**
+   * Implements ArrayAccess::offsetUnset.
+   *
+   * Alias of DrupalConfig::clear. Allows you to do this:
+   * @code
+   * isset($config['foo']);
+   * @endcode
+   */
+  public function offsetUnset($name){
+    $this->clear($name);
+  }
 }
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
index 56e5ecf..758eeb7 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
@@ -41,7 +41,7 @@ function testCRUD() {
     $this->assertIdentical($actual_data, array('value' => 'initial'));
 
     // Update the configuration object instance.
-    $config->set('value', 'instance-update');
+    $config['value'] = 'instance-update';
     $config->save();
     $this->assertIdentical($config->isNew(), FALSE);
 
@@ -99,7 +99,7 @@ function testCRUD() {
     );
     $new_config->merge($expected_values);
     $new_config->save();
-    $this->assertIdentical($new_config->get('value'), $expected_values['value']);
+    $this->assertIdentical($new_config['value'], $expected_values['value']);
     $this->assertIdentical($new_config->get('404'), $expected_values['404']);
   }