diff --git a/google_admanager.module b/google_admanager.module
index f1f86b7..a8c50c2 100644
--- a/google_admanager.module
+++ b/google_admanager.module
@@ -196,7 +196,7 @@ function google_admanager_add_js($js = NULL, $type = 'slot') {
     //add the init and service scripts the first time this is run
     if (!isset($ga_js['init'])) {
       //drupal_add_js can't load externaljs in 6, but it will in 7. this is a workaround.
-      $external_js = 'http://partner.googleadservices.com/gampad/google_service.js';
+      $external_js = '//partner.googleadservices.com/gampad/google_service.js';
       google_admanager_add_js('document.write(unescape("%3Cscript src=\''. $external_js . '\' type=\'text/javascript\'%3E%3C/script%3E"));', 'init');
       $id = variable_get('google_admanager_account', '');
       google_admanager_add_js('GS_googleAddAdSenseService("'. $id .'");', 'service');