diff --git a/tasks/backup.yml b/tasks/backup.yml
index cacae76..9d03d81 100644
--- a/tasks/backup.yml
+++ b/tasks/backup.yml
@@ -12,7 +12,7 @@
     job: '/usr/bin/pg_dumpall | gzip > /opt/postgresbackup/$(date "+\%Y\%m\%d-\%H\%M.sql.gz")'
     user: postgres
     hour: "*/4"
-    minute: 45
+    minute: "45"
 
 - name: add backup cleanup cronjob
   cron:
diff --git a/tasks/main.yml b/tasks/main.yml
index 1acb295..0eb33e4 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -35,8 +35,8 @@
     name: db maintenance
     job: "/usr/bin/vacuumdb --all --analyze > /dev/null"
     user: postgres
-    hour: 23
-    minute: 26
+    hour: "23"
+    minute: "26"
 
 - include_tasks: backup.yml
   when: