diff --git a/bundles/zfs/metadata.py b/bundles/zfs/metadata.py
index 115adb4..d91112c 100644
--- a/bundles/zfs/metadata.py
+++ b/bundles/zfs/metadata.py
@@ -37,12 +37,12 @@ defaults = {
     'systemd-timers': {
         'zfs-trim': {
             'command': '/usr/lib/zfs-linux/trim',
-            'when': 'hourly',
+            'when': '*-*-16 02:00',
             'persistent': True,
         },
         'zfs-scrub': {
             'command': '/usr/lib/zfs-linux/scrub',
-            'when': '*-2,4,6,8,10,12-1 02:00:00',
+            'when': '*-2,4,6,8,10,12-1 02:00',
             'persistent': True,
         },
         'zfs-auto-snapshot-hourly': {
diff --git a/groups/os/linux.py b/groups/os/linux.py
index 9f4052c..c199306 100644
--- a/groups/os/linux.py
+++ b/groups/os/linux.py
@@ -15,6 +15,12 @@
         'systemd-timers',
     ],
     'metadata': {
+        'systemd-timers': {
+            'trim': {
+                'command': '/usr/sbin/fstrim -v /',
+                'when': 'daily',
+            },
+        },
         'hosts': {
             '10.0.10.2': [
                 'resolver.name',