diff --git a/tasks/docker_setup.yml b/tasks/docker_setup.yml
index e8db464..75561c4 100644
--- a/tasks/docker_setup.yml
+++ b/tasks/docker_setup.yml
@@ -121,7 +121,7 @@
         name: Prune docker volumes
         cron_file: docker-prune-volumes
         minute: "0"
-        hours: "*/12"
+        hour: "*/12"
         user: root
         state: present
         job: "/usr/local/sbin/docker-prune-dangling-volumes"
@@ -132,7 +132,7 @@
         name: Prune docker volumes
         cron_file: docker-prune-volumes
         minute: "0"
-        hours: "*/12"
+        hour: "*/12"
         user: root
         state: absent
         job: "/usr/local/sbin/docker-prune-dangling-volumes"