diff --git a/core/misc/ajax.js b/core/misc/ajax.js
index fefe9f3..00f5c7e 100644
--- a/core/misc/ajax.js
+++ b/core/misc/ajax.js
@@ -50,25 +50,7 @@
         }
       }
 
-      // Bind Ajax behaviors to all items showing the class.
-      $('.use-ajax').once('ajax').each(function () {
-        var element_settings = {};
-        // Clicked links look better with the throbber than the progress bar.
-        element_settings.progress = {type: 'throbber'};
-
-        // For anchor tags, these will go to the target of the anchor rather
-        // than the usual location.
-        var href = $(this).attr('href');
-        if (href) {
-          element_settings.url = href;
-          element_settings.event = 'click';
-        }
-        element_settings.dialogType = $(this).data('dialog-type');
-        element_settings.dialog = $(this).data('dialog-options');
-        element_settings.base = $(this).attr('id');
-        element_settings.element = this;
-        Drupal.ajax(element_settings);
-      });
+      Drupal.ajax.bindAjaxLinks($(window));
 
       // This class means to submit the form to the action using Ajax.
       $('.use-ajax-submit').once('ajax').each(function () {
@@ -277,6 +259,34 @@
   };
 
   /**
+   * Bind Ajax functionality to links that use the 'use-ajax' class.
+   *
+   * @param $element
+   *   Element to enable Ajax functionality for.
+   */
+  Drupal.ajax.bindAjaxLinks = function ($element) {
+    // Bind Ajax behaviors to all items showing the class.
+    $element.find('.use-ajax').once('ajax').each(function () {
+      var element_settings = {};
+      // Clicked links look better with the throbber than the progress bar.
+      element_settings.progress = {type: 'throbber'};
+
+      // For anchor tags, these will go to the target of the anchor rather
+      // than the usual location.
+      var href = $(this).attr('href');
+      if (href) {
+        element_settings.url = href;
+        element_settings.event = 'click';
+      }
+      element_settings.dialogType = $(this).data('dialog-type');
+      element_settings.dialog = $(this).data('dialog-options');
+      element_settings.base = $(this).attr('id');
+      element_settings.element = this;
+      Drupal.ajax(element_settings);
+    });
+  };
+
+  /**
    * Settings for an Ajax object.
    *
    * @typedef {object} Drupal.Ajax~element_settings
diff --git a/core/modules/contextual/js/contextual.js b/core/modules/contextual/js/contextual.js
index 7f93a15..0f08b31 100644
--- a/core/modules/contextual/js/contextual.js
+++ b/core/modules/contextual/js/contextual.js
@@ -81,6 +81,9 @@
     // trigger the model change event handler in its views.
     contextual.collection.add(model);
 
+    // Enable Ajax functionality for contextual links.
+    Drupal.ajax.bindAjaxLinks($region);
+
     // Let other JavaScript react to the adding of a new contextual link.
     $(document).trigger('drupalContextualLinkAdded', {
       $el: $contextual,
diff --git a/core/modules/contextual/tests/modules/contextual_ajax_test/contextual_ajax_test.info.yml b/core/modules/contextual/tests/modules/contextual_ajax_test/contextual_ajax_test.info.yml
new file mode 100644
index 0000000..b2ad373
--- /dev/null
+++ b/core/modules/contextual/tests/modules/contextual_ajax_test/contextual_ajax_test.info.yml
@@ -0,0 +1,10 @@
+name: 'Contextual Ajax tests'
+type: module
+description: 'Provides contextual Ajax tests.'
+package: Testing
+version: VERSION
+core: 8.x
+dependencies:
+  - contextual
+  - block
+  - router_test
diff --git a/core/modules/contextual/tests/modules/contextual_ajax_test/contextual_ajax_test.links.contextual.yml b/core/modules/contextual/tests/modules/contextual_ajax_test/contextual_ajax_test.links.contextual.yml
new file mode 100644
index 0000000..c58afcb
--- /dev/null
+++ b/core/modules/contextual/tests/modules/contextual_ajax_test/contextual_ajax_test.links.contextual.yml
@@ -0,0 +1,4 @@
+contextual_ajax_test:
+  title: 'Contextual Ajax Test'
+  route_name: 'router_test.2'
+  group: 'block'
diff --git a/core/modules/contextual/tests/modules/contextual_ajax_test/contextual_ajax_test.module b/core/modules/contextual/tests/modules/contextual_ajax_test/contextual_ajax_test.module
new file mode 100644
index 0000000..5c9afcb
--- /dev/null
+++ b/core/modules/contextual/tests/modules/contextual_ajax_test/contextual_ajax_test.module
@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * @file
+ * Test Contextual links that use Ajax
+ */
+
+/**
+ * Implements hook_contextual_links_view_alter().
+ *
+ * Change Configure Blocks into modal links.
+ */
+function contextual_ajax_test_contextual_links_view_alter(&$element, $items) {
+  drupal_set_message('fffff');
+  if (isset($element['#links']['contextual-ajax-test'])) {
+    $element['#links']['contextual-ajax-test']['attributes'] = [
+      'class' => ['use-ajax'],
+      'data-dialog-type' => 'modal',
+    ];
+  }
+}