diff --git a/edit_list.php b/edit_list.php
index 00d179f..2310ccb 100644
--- a/edit_list.php
+++ b/edit_list.php
@@ -12,7 +12,7 @@ if (!isset($_SESSION["auth"]) || $_SESSION["auth"] != 1)
 
 // We do not print any error in the next three cases, because a legitimate
 // user will never produce such results, even with disabled javascript
-if ( preg_match("/[^a-z0-9_]/", $list_name) )
+if ( preg_match("/[^a-z0-9_-]/", $list_name) )
 {
     header("Location: error.php");
     exit();