diff --git a/install/mods-for-hesk/sql/uninstallSql.php b/install/mods-for-hesk/sql/uninstallSql.php
index 2907815e..681d2043 100644
--- a/install/mods-for-hesk/sql/uninstallSql.php
+++ b/install/mods-for-hesk/sql/uninstallSql.php
@@ -52,6 +52,10 @@ function replaceStatusColumn()
 
 function removeOtherColumns()
 {
+    global $hesk_settings;
+
+    hesk_dbConnect();
+    
     executeQuery("ALTER TABLE `" . hesk_dbEscape($hesk_settings['db_pfix']) . "users` DROP COLUMN `autorefresh`");
     executeQuery("ALTER TABLE `" . hesk_dbEscape($hesk_settings['db_pfix']) . "tickets` DROP COLUMN `parent`");
     executeQuery("ALTER TABLE `" . hesk_dbEscape($hesk_settings['db_pfix']) . "users` DROP COLUMN `can_manage_settings`");