diff --git a/testsite/playbooks/mail.yml b/testsite/playbooks/mail.yml
index a1dadbc5c92e6e049fd3928dd5a8f2af1d3d322b..374c02cf28364fdfdca50915d7bb13819476d049 100644
--- a/testsite/playbooks/mail.yml
+++ b/testsite/playbooks/mail.yml
@@ -2,7 +2,7 @@
 
 - hosts: mail
   remote_user: ansible
-  become: yes
+  become: true
   roles:
     - common
     - ldap_client