diff --git a/theme/standard/styles.php b/theme/standard/styles.php
index 5e9afd81627..11a51fcd119 100644
--- a/theme/standard/styles.php
+++ b/theme/standard/styles.php
@@ -4,7 +4,7 @@
 
     $nomoodlecookie = true;
     require_once("../../config.php"); 
-    $themeurl = style_sheet_setup(filemtime("styles.php"), 300, 'standard');
+    $themeurl = style_sheet_setup(filemtime("styles.php"), 300, $themename);
 
 /// From here on it's nearly a normal stylesheet. 
 /// First are some CSS definitions for normal tags,