diff --git a/smarty.inc.php b/smarty.inc.php
index c077514a..6fe3313c 100644
--- a/smarty.inc.php
+++ b/smarty.inc.php
@@ -53,6 +53,7 @@ class PFASmarty {
 $smarty = new PFASmarty();
 
 $CONF['theme_css']  = $CONF['postfix_admin_url'].'/'.htmlentities($CONF['theme_css']);
+if ($CONF['theme_custom_css'] != "") $CONF['theme_custom_css']  = $CONF['postfix_admin_url'].'/'.htmlentities($CONF['theme_custom_css']);
 $CONF['theme_logo'] = $CONF['postfix_admin_url'].'/'.htmlentities($CONF['theme_logo']);
 
 $smarty->assign ('CONF', $CONF);