diff --git a/images/commons/lagoon/cronjob.sh b/images/commons/lagoon/cronjob.sh
index a92c6cc76..b9faba0c6 100755
--- a/images/commons/lagoon/cronjob.sh
+++ b/images/commons/lagoon/cronjob.sh
@@ -11,4 +11,4 @@ trap exit_trap EXIT
 
 echo "$(date --utc +%FT%TZ) CRONJOB: $@"
 
-/lagoon/entrypoints.sh sh -c "$@"
+/lagoon/entrypoints.sh flock -n "/tmp/cron.lock.$(echo "$@" | sha256sum | awk '{ print $1 }')" sh -c "$@"