diff --git a/core/modules/update/src/Plugin/migrate/source/UpdateSettings.php b/core/modules/update/src/Plugin/migrate/source/UpdateSettings.php
index 7deb6c0..006f336 100644
--- a/core/modules/update/src/Plugin/migrate/source/UpdateSettings.php
+++ b/core/modules/update/src/Plugin/migrate/source/UpdateSettings.php
@@ -22,7 +22,9 @@ class UpdateSettings extends Variable {
    */
   protected function values() {
     $values = parent::values();
-    $values['update_fetch_url'] = 'https://updates.drupal.org/release-history';
+    if (empty($values['update_fetch_url']) || strpos($values['update_fetch_url'], 'http://updates.drupal.org/release-history') !== FALSE) {
+      $values['update_fetch_url'] = 'https://updates.drupal.org/release-history';
+    }
     return $values;
   }