diff --git a/files/docker-prune-dangling-images.sh b/files/docker-prune-dangling-images.sh
index b7a11a1..ea6c5d3 100644
--- a/files/docker-prune-dangling-images.sh
+++ b/files/docker-prune-dangling-images.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 
 # "system" prune, because pruning images only leaves a lot of garbage around
-docker volume prune --force > /var/log/docker-volume-prune.log 2>&1
+docker system prune  --force >> /var/log/docker-system-prune.log 2>&1
 exit 0
diff --git a/files/docker-prune-dangling-volumes.sh b/files/docker-prune-dangling-volumes.sh
index d22e905..d78590e 100644
--- a/files/docker-prune-dangling-volumes.sh
+++ b/files/docker-prune-dangling-volumes.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 
 # "system" prune, because pruning images only leaves a lot of garbage around
-docker system prune --force > /var/log/docker-prune.log 2>&1
+docker volume prune --force > /var/log/docker-volumes-prune.log 2>&1
 exit 0
diff --git a/tasks/docker_setup.yml b/tasks/docker_setup.yml
index 24f8f8e..e8db464 100644
--- a/tasks/docker_setup.yml
+++ b/tasks/docker_setup.yml
@@ -120,7 +120,8 @@
       cron:
         name: Prune docker volumes
         cron_file: docker-prune-volumes
-        special_time: daily
+        minute: "0"
+        hours: "*/12"
         user: root
         state: present
         job: "/usr/local/sbin/docker-prune-dangling-volumes"
@@ -130,7 +131,8 @@
       cron:
         name: Prune docker volumes
         cron_file: docker-prune-volumes
-        special_time: daily
+        minute: "0"
+        hours: "*/12"
         user: root
         state: absent
         job: "/usr/local/sbin/docker-prune-dangling-volumes"