Index: html/includes/functions.inc.php
===================================================================
--- html/includes/functions.inc.php	(revision 4862)
+++ html/includes/functions.inc.php	(working copy)
@@ -970,7 +970,7 @@
     } else {
       $nfsen_filename = $basefilename_underscored;
     }
-    $nfsen_rrd_file = $nfsenrrd . $basefilename_underscored . '.rrd';
+    $nfsen_rrd_file = $nfsenrrd . $nfsen_filename . '.rrd';
     if (is_file($nfsen_rrd_file))
     {
       return $nfsen_rrd_file;