--- includes/common.inc	2016-03-31 13:04:01.245367036 +0200
+++ includes/common.inc	2016-03-31 13:03:51.805398634 +0200
@@ -4206,6 +4206,17 @@
     $jquery_added = FALSE;
   }
 
+  // If no type is specified and the URL is external, force the type to external
+  if (url_is_external($data)) {
+    if(is_array($options) && !array_key_exists('type',$options)) {
+      $options['type'] = 'external';
+    } elseif (is_null($options)) {
+      $options = 'external';
+    }
+  }
+
   // Construct the options, taking the defaults into consideration.
   if (isset($options)) {
     if (!is_array($options)) {