diff --git a/src/Form/QuicklinkConfigForm.php b/src/Form/QuicklinkConfigForm.php
index 7b282f9ec66cda154ca6b40d5fc6576a9a6090ef..b043e2614dd4d32025b326c74918fcb649acdc06 100644
--- a/src/Form/QuicklinkConfigForm.php
+++ b/src/Form/QuicklinkConfigForm.php
@@ -282,7 +282,7 @@ class QuicklinkConfigForm extends ConfigFormBase {
     $form['polyfill']['load_polyfill'] = [
       '#type' => 'checkbox',
       '#title' => $this->t('Load <em>Intersection Observer</em> polyfill'),
-      '#description' => $this->t('This checkbox will enable loading of necessary polyfills from <a href="https://polyfill.io" target="_blank">polyfill.io</a>. This will enable usage of Quicklink in IE11 and older versions modern browsers.'),
+      '#description' => $this->t('This checkbox will enable loading of necessary polyfills from <a href="https://polyfill-fastly.io" target="_blank">polyfill-fastly.io</a>. This will enable usage of Quicklink in IE11 and older versions modern browsers.'),
       '#default_value' => $config->get('load_polyfill'),
     ];
 
diff --git a/tests/src/Nightwatch/Tests/integrationTest.js b/tests/src/Nightwatch/Tests/integrationTest.js
index 4bed1182007bfd8d645d5c2b12f62cade47644ce..81d4ccad2671fc26402b1ceb7cc0a61efbd17582 100644
--- a/tests/src/Nightwatch/Tests/integrationTest.js
+++ b/tests/src/Nightwatch/Tests/integrationTest.js
@@ -121,7 +121,7 @@ module.exports = {
       )
 
       // Verify polyfill is not loaded.
-      .assert.not.elementPresent('script[src*="polyfill.io"][src*="IntersectionObserver"]');
+      .assert.not.elementPresent('script[src*="polyfill-fastly.io"][src*="IntersectionObserver"]');
   },
   'Change and then verify updated settings': (browser) => {
     browser
@@ -240,7 +240,7 @@ module.exports = {
       .waitForElementVisible('body')
 
       // Verify polyfill is loaded.
-      .assert.elementPresent('script[src*="polyfill.io"][src*="IntersectionObserver"]')
+      .assert.elementPresent('script[src*="polyfill-fastly.io"][src*="IntersectionObserver"]')
 
       // Verify that links within admin containers are now prefetched.
       .assert.not.elementIgnored('<div id="block-local-tasks-block"><a href="/test">test</a></div>')