diff --git a/user.inc.php b/user.inc.php
index 064106f7..9e432c0d 100644
--- a/user.inc.php
+++ b/user.inc.php
@@ -460,6 +460,7 @@ function user_purge($u, $type=false)
 /* Duplicate a row in the users table, or any one of the users_* tables. */
 function user_dupe_row($db, $key, $val, $newval)
 {
+	global $config;
 	$nullfields = array('deleteddatetime'); /* Fields that can be null */
 	$q = mysql_query("SELECT * FROM $db WHERE $key='$val'");
 	if(mysql_num_rows($q) != 1) {