diff --git supercron.classes.inc supercron.classes.inc
index a4bae65..466d70c 100644
--- supercron.classes.inc
+++ supercron.classes.inc
@@ -439,6 +439,7 @@ class supercron_module {
 
         if ($this->multithread OR $forced_multithreading) {
             $url = str_replace('%', $this->module_name, supercron_registry()->get_external_invocation_url());
+	    $url = url($url,array(absolute => TRUE));
             _supercron_parallel_call($url);
         }
         else {