Index: shorturl.admin.inc
===================================================================
--- shorturl.admin.inc	(revision 13)
+++ shorturl.admin.inc	(working copy)
@@ -15,7 +15,7 @@
   $form['shorturl_domain'] = array(
     '#type' => 'textfield',
     '#title' => t('Short Domain'),
-    '#default_value' => variable_get('shorturl_domain', $_SERVER['HTTP_HOST']),
+    '#default_value' => variable_get('shorturl_domain', 'http://' . $_SERVER['HTTP_HOST']),
     '#required' => TRUE,
     '#description' => t('The domain to be used in shortened URLs. Please use the absolute URL format (i.e. http://example.com).'),
   );
Index: shorturl.module
===================================================================
--- shorturl.module	(revision 18)
+++ shorturl.module	(working copy)
@@ -373,7 +373,7 @@
   $token = _shorturl_get_token($long_url);
   
   if ($full_url) {
-    $domain = variable_get('shorturl_domain', $_SERVER['HTTP_HOST']);
+    $domain = variable_get('shorturl_domain', 'http://' . $_SERVER['HTTP_HOST']);
     if (substr(trim($domain), -1, 1) != '/') { 
       $domain .= '/';
     }