diff --git a/bundles/bootshorn/metadata.py b/bundles/bootshorn/metadata.py
index 0685495..89feb0c 100644
--- a/bundles/bootshorn/metadata.py
+++ b/bundles/bootshorn/metadata.py
@@ -25,7 +25,7 @@ defaults = {
     'systemd-timers': {
         'bootshorn-temperature': {
             'command': '/opt/bootshorn/temperature',
-            'when': 'minutely',
+            'when': '*:0/15',
             'working_dir': '/opt/bootshorn',
             'user': 'ckn',
             'group': 'ckn',