diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index c24f9fc2036..bdaaffdafe3 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -448,7 +448,7 @@ if (! defined('NOLOGIN'))
                 $dol_tz=$_POST["tz"];
                 $dol_tz_string=$_POST["tz_string"];
                 $dol_tz_string=preg_replace('/\s*\(.+\)$/','',$dol_tz_string);
-                $dol_tz_string=preg_replace('/,/'	,'/',$dol_tz_string);
+                $dol_tz_string=preg_replace('/,/','/',$dol_tz_string);
                 $dol_tz_string=preg_replace('/\s/','_',$dol_tz_string);
                 $dol_dst=0;
                 if (isset($_POST["dst_first"]) && isset($_POST["dst_second"]))