diff --git a/wo/cli/plugins/stack_pref.py b/wo/cli/plugins/stack_pref.py
index 5ec4fce..16add4b 100644
--- a/wo/cli/plugins/stack_pref.py
+++ b/wo/cli/plugins/stack_pref.py
@@ -28,7 +28,6 @@ def pre_pref(self, apt_packages):
 
     if (set(WOVariables.wo_mysql).issubset(set(apt_packages)) or
             set(WOVariables.wo_mysql_client).issubset(set(apt_packages))):
-            set(['mariadb-backup']).issubset(set(apt_packages))):
         # add mariadb repository excepted on raspbian and ubuntu 19.04
         if (not WOVariables.wo_distro == 'raspbian'):
             Log.info(self, "Adding repository for MySQL, please wait...")