diff --git a/core/includes/form.inc b/core/includes/form.inc
index 94e61d6..ec07d6e 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -3834,7 +3834,7 @@ function form_process_machine_name($element, &$form_state) {
       'machineName' => array(
         '#' . $source['#id'] => $element['#machine_name'],
       ),
-      'language' => $language->langcode,
+      'langcode' => $language->langcode,
     ),
   );
   $element['#attached']['library'][] = array('system', 'drupal.machine-name');
diff --git a/core/misc/machine-name.js b/core/misc/machine-name.js
index 534f389..1db3b41 100644
--- a/core/misc/machine-name.js
+++ b/core/misc/machine-name.js
@@ -159,7 +159,7 @@ Drupal.behaviors.machineName = {
   transliterate: function (source, settings) {
     return $.get(drupalSettings.basePath + 'machine_name/transliterate', {
         text: source,
-        language: drupalSettings.language,
+        langcode: drupalSettings.langcode,
         replace_pattern: settings.replace_pattern,
         replace: settings.replace,
         lowercase: true
diff --git a/core/modules/system/lib/Drupal/system/MachineNameController.php b/core/modules/system/lib/Drupal/system/MachineNameController.php
index 730cd7e..4a63f16 100644
--- a/core/modules/system/lib/Drupal/system/MachineNameController.php
+++ b/core/modules/system/lib/Drupal/system/MachineNameController.php
@@ -45,12 +45,12 @@ public function __construct(PHPTransliteration $transliteration) {
    */
   public function transliterate(Request $request) {
     $text = $request->query->get('text');
-    $language = $request->query->get('language');
+    $langcode = $request->query->get('langcode');
     $replace_pattern = $request->query->get('replace_pattern');
     $replace = $request->query->get('replace');
     $lowercase = $request->query->get('lowercase');
 
-    $transliterated = $this->transliteration->transliterate($text, $language, '_');
+    $transliterated = $this->transliteration->transliterate($text, $langcode, '_');
     if($lowercase) {
       $transliterated = drupal_strtolower($transliterated);
     }