diff --git a/contrib/icinga2/CheckCommands.conf b/contrib/icinga2/CheckCommands.conf
index 8902895a..f3209d20 100644
--- a/contrib/icinga2/CheckCommands.conf
+++ b/contrib/icinga2/CheckCommands.conf
@@ -23,7 +23,7 @@ object CheckCommand "madrisan-clock" {
 	arguments += {
 		"-r" = {
 			description = "the clock reference (in seconds since the Epoch)"
-			value = DateTime().format("%s")
+			value = {{ DateTime().format("%s") }}
 		}
 		"-w" = {
 			description = "Warning threshold"