diff --git a/core/lib/Drupal/Core/Language/Language.php b/core/lib/Drupal/Core/Language/Language.php
index cf2248b..d8df0cb 100644
--- a/core/lib/Drupal/Core/Language/Language.php
+++ b/core/lib/Drupal/Core/Language/Language.php
@@ -142,15 +142,6 @@ public function getId() {
   /**
    * {@inheritdoc}
    */
-  public function setId($id) {
-    $this->id = $id;
-
-    return $this;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function getDirection() {
     return $this->direction;
   }
diff --git a/core/lib/Drupal/Core/Language/LanguageInterface.php b/core/lib/Drupal/Core/Language/LanguageInterface.php
index e718749..04ad426 100644
--- a/core/lib/Drupal/Core/Language/LanguageInterface.php
+++ b/core/lib/Drupal/Core/Language/LanguageInterface.php
@@ -123,16 +123,6 @@ public function setName($name);
   public function getId();
 
   /**
-   * Sets the ID (language code).
-   *
-   * @param string $id
-   *   The language code.
-   *
-   * @return $this
-   */
-  public function setId($id);
-
-  /**
    * Gets the text direction (left-to-right or right-to-left).
    *
    * @return int
diff --git a/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php b/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php
index 7308d07..84ee5fc 100644
--- a/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php
@@ -51,7 +51,8 @@ public function testGetName() {
    */
   public function testGetLangcode() {
     $language_code = $this->randomMachineName(2);
-    $this->assertSame($this->language, $this->language->setId($language_code));
+    $language = new Language(array(id=>$language_code));
+    $this->assertSame($this->language, $language);
     $this->assertSame($language_code, $this->language->getId());
   }
 
@@ -115,20 +116,17 @@ public function testSortArrayOfLanguages(array $languages, array $expected) {
    *   An array of test data.
    */
   public function providerTestSortArrayOfLanguages() {
-    $language9A = new Language();
+    $language9A = new Language(array(id=>'dd'));
     $language9A->setName('A');
     $language9A->setWeight(9);
-    $language9A->setId('dd');
 
-    $language10A = new Language();
+    $language10A = new Language(array(id=>'ee'));
     $language10A->setName('A');
     $language10A->setWeight(10);
-    $language10A->setId('ee');
 
-    $language10B = new Language();
+    $language10B = new Language(array(id=>'ff'));
     $language10B->setName('B');
     $language10B->setWeight(10);
-    $language10B->setId('ff');
 
     return array(
       // Set up data set #0, already ordered by weight.