diff --git a/core/modules/system/src/Tests/System/DefaultMobileMetaTagsTest.php b/core/modules/system/src/Tests/System/DefaultMobileMetaTagsTest.php
index ae2d3f4..c9cfcb9 100644
--- a/core/modules/system/src/Tests/System/DefaultMobileMetaTagsTest.php
+++ b/core/modules/system/src/Tests/System/DefaultMobileMetaTagsTest.php
@@ -26,7 +26,7 @@ class DefaultMobileMetaTagsTest extends WebTestBase {
   protected function setUp() {
     parent::setUp();
     $this->defaultMetaTags = array(
-      'viewport' => '<meta name="viewport" content="width=device-width, initial-scale=1.0" />',
+      'viewport' => '<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" />',
     );
   }
 
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index c12a2d4..771a9d5 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -582,7 +582,7 @@ function system_page_attachments(array &$page) {
       '#tag' => 'meta',
       '#attributes' => array(
         'name' => 'viewport',
-        'content' => 'width=device-width, initial-scale=1.0',
+        'content' => 'width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0',
       ),
     ),
   );