diff --git a/defaults/main.yml b/defaults/main.yml
index dc1d300..655a606 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -7,4 +7,4 @@ ntp_servers:
 ntp_timezone: Europe/Berlin
 
 # Varaiables only used on UCS systems
-ntp_signed_requests: yes
+ntp_signed_requests: 'yes'