diff --git a/core/lib/Drupal/Core/Config/Config.php b/core/lib/Drupal/Core/Config/Config.php
index 7c150e9121a..034dff18fd9 100644
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -346,7 +346,6 @@ class Config {
    *   The configuration object.
    */
   public function save() {
-    $this->sortByKey($this->data);
     $this->storage->write($this->name, $this->data);
     $this->isNew = FALSE;
     $this->notify('save');
@@ -369,26 +368,6 @@ class Config {
     return $this;
   }
 
-  /**
-   * Sorts all keys in configuration data.
-   *
-   * Ensures that re-inserted keys appear in the same location as before, in
-   * order to ensure an identical order regardless of storage controller.
-   * A consistent order is important for any storage that allows any kind of
-   * diff operation.
-   *
-   * @param array $data
-   *   An associative array to sort recursively by key name.
-   */
-  public function sortByKey(array &$data) {
-    ksort($data);
-    foreach ($data as &$value) {
-      if (is_array($value)) {
-        $this->sortByKey($value);
-      }
-    }
-  }
-
   /**
    * Deletes the configuration object.
    *
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
index 9eea495957d..c755b4a46fe 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
@@ -92,30 +92,4 @@ class ConfigCRUDTest extends WebTestBase {
     $this->assertIdentical($renamed_config->isNew(), FALSE);
   }
 
-  /**
-   * Tests Drupal\Core\Config\Config::sortByKey().
-   */
-  function testDataKeySort() {
-    $config = config('config_test.keysort');
-    $config->set('new', 'Value to be replaced');
-    $config->set('static', 'static');
-    $config->save();
-    // Clone this Config, so this test does not rely on any particular
-    // architecture.
-    $config = clone $config;
-
-    // Load the configuration data into a new object.
-    $new_config = config('config_test.keysort');
-    // Clear the 'new' key that came first.
-    $new_config->clear('new');
-    // Add a new 'new' key and save.
-    $new_config->set('new', 'Value to be replaced');
-    $new_config->save();
-
-    // Verify that the data of both objects is in the identical order.
-    // assertIdentical() is the required essence of this test; it performs a
-    // strict comparison, which means that keys and values must be identical and
-    // their order must be identical.
-    $this->assertIdentical($new_config->get(), $config->get());
-  }
 }
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigImportTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigImportTest.php
index 9316962398d..2266732157c 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigImportTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigImportTest.php
@@ -128,10 +128,10 @@ class ConfigImportTest extends WebTestBase {
     $staging->write($name, $original_name_data);
     $original_dynamic_data = array(
       'id' => 'new',
-      'label' => 'New',
-      'langcode' => 'und',
-      'style' => '',
       'uuid' => '30df59bd-7b03-4cf7-bb35-d42fc49f0651',
+      'label' => 'New',
+      'style' => '',
+      'langcode' => 'und',
     );
     $staging->write($dynamic_name, $original_dynamic_data);
     $this->assertIdentical($staging->exists($name), TRUE, $name . ' found.');