diff --git a/tasks/main.yml b/tasks/main.yml
index 5f14f55..c4a3d95 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -51,7 +51,7 @@
     name: db backup
     job: '/usr/bin/pg_dumpall | gzip > /opt/postgresbackup/$(date "+\%Y\%m\%d-\%H\%M.sql.gz")'
     user: postgres
-    hour: */4
+    hour: "*/4"
     minute: 45
 
 - name: add backup cleanup cronjob