diff --git a/salesforce.module b/salesforce.module
index 787e00f..787f5ea 100644
--- a/salesforce.module
+++ b/salesforce.module
@@ -42,7 +42,11 @@ function salesforce_help($path, $arg) {
       $output .= '<li>' . t('You will need to create a remote application/connected app for authorization.') . '</li>';
       $output .= '<ul>';
       $output .= '<li>' . t('In Salesforce go to Your Name > Setup > Create > Apps then create a new Connected App. (Depending on your Salesforce instance, you may need to go to Your Name > Setup > Develop > Remote Access.)') . '</li>';
-      $output .= '<li>' . t('Set the callback URL to: !url (SSL is required)', array('!url' => '<code>' . 'https://' . $_SERVER['HTTP_HOST'] . '/salesforce/oauth_callback' . '</code>')) . '</li>';
+      $output .= '<li>' . t('Set the callback URL to: !url (SSL is required)', array(
+        '!url' => '<code>' . url('salesforce/oauth_callback', array(
+          'absolute' => TRUE,
+          'https' => TRUE,
+        )) .  '</code>')) . '</li>';
       $output .= '<li>' . t('Select at least "Perform requests on your behalf at any time" for OAuth Scope
   as well as the appropriate other scopes for your application. Note that "Full access" does not include the "Perform requests on your behalf at any time" scope! !info.', array('!info' => l(t('Additional information'), 'https://help.salesforce.com/help/doc/en/remoteaccess_about.htm'))) . '</li>';
       $output .= '<li>' . t('For more help see !salesforce.', array('!salesforce' => l(t('the salesforce.com documentation'), 'https://www.salesforce.com/us/developer/docs/api_rest/Content/quickstart_oauth.htm'))) . '</li>';