diff --git a/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationUrl.php b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationUrl.php
index 25b5484..9162015 100644
--- a/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationUrl.php
+++ b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationUrl.php
@@ -103,12 +103,14 @@ public function processInbound($path, Request $request) {
     $parts = explode('/', trim($path, '/'));
     $prefix = array_shift($parts);
 
-    // Search prefix within added languages.
-    foreach ($this->languageManager->getLanguages() as $language) {
-      if (isset($config['prefixes'][$language->getId()]) && $config['prefixes'][$language->getId()] == $prefix) {
-        // Rebuild $path with the language removed.
-        $path = '/' . implode('/', $parts);
-        break;
+    if ($config['source'] == LanguageNegotiationUrl::CONFIG_PATH_PREFIX) {
+      // Search prefix within added languages.
+      foreach ($this->languageManager->getLanguages() as $language) {
+        if (isset($config['prefixes'][$language->getId()]) && $config['prefixes'][$language->getId()] == $prefix) {
+          // Rebuild $path with the language removed.
+          $path = '/' . implode('/', $parts);
+          break;
+        }
       }
     }
 
diff --git a/core/modules/language/tests/src/Functional/LanguageNegotiationUrlTest.php b/core/modules/language/tests/src/Functional/LanguageNegotiationUrlTest.php
new file mode 100644
index 0000000..8472ff7
--- /dev/null
+++ b/core/modules/language/tests/src/Functional/LanguageNegotiationUrlTest.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace Drupal\Tests\language\Functional;
+
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * @coversDefaultClass \Drupal\language\Plugin\LanguageNegotiation\LanguageNegotiationUrl
+ * @group language
+ */
+class LanguageNegotiationUrlTest extends BrowserTestBase {
+
+  use StringTranslationTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'language',
+    'node',
+    'path',
+  ];
+
+  /**
+   * @var \Drupal\user\Entity\User
+   */
+  protected $user;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Create an Article node type.
+    if ($this->profile != 'standard') {
+      $this->drupalCreateContentType(['type' => 'article']);
+    }
+
+    $this->user = $this->drupalCreateUser([
+      'administer languages',
+      'access administration pages',
+      'view the administration theme',
+      'administer nodes',
+      'create article content',
+      'create url aliases',
+    ]);
+    $this->drupalLogin($this->user);
+
+    $this->drupalPostForm('admin/config/regional/language/add', ['predefined_langcode' => 'de'], $this->t('Add language'));
+  }
+
+  /**
+   * @covers ::processInbound
+   */
+  public function testDomain() {
+    // Check if paths that contain language prefixes can be reached when
+    // language is taken from the domain.
+    $edit = [
+      'language_negotiation_url_part' => 'domain',
+      'prefix[en]' => 'eng',
+      'prefix[de]' => 'de',
+      'domain[en]' => $_SERVER['HTTP_HOST'],
+      'domain[de]' => "de.$_SERVER[HTTP_HOST]",
+    ];
+    $this->drupalPostForm('admin/config/regional/language/detection/url', $edit, $this->t('Save configuration'));
+
+    $nodeValues = [
+      'title[0][value]' => 'Test',
+      'path[0][alias]' => '/eng/test',
+    ];
+    $this->drupalPostForm('node/add/article', $nodeValues, $this->t('Save and publish'));
+    $this->assertSession()->statusCodeEquals(200);
+  }
+
+}
diff --git a/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php b/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php
index 1134ecc..6412ef8 100644
--- a/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php
+++ b/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php
@@ -120,6 +120,7 @@ function testProcessInbound() {
         'language.negotiation' => array(
           'url' => array(
             'prefixes' => array('fr' => 'fr'),
+            'source' => LanguageNegotiationUrl::CONFIG_PATH_PREFIX,
           ),
         ),
       )