diff --git a/heroic_api/tasks.py b/heroic_api/tasks.py
index 6ddf8bc..5f8bbc5 100644
--- a/heroic_api/tasks.py
+++ b/heroic_api/tasks.py
@@ -30,7 +30,7 @@ def poll_rubin_schedule():
     # Get the schedule from 15 minutes in the past until 25 hours later
     start = datetime.now() - timedelta(minutes=15)
     logger.info(f'Getting the Rubin schedule starting at {start.isoformat()}')
-    params = {'time': '25', 'start': start.isoformat()}
+    params = {'time': '25', 'start': start.strftime('%Y-%m-%d %H:%M:%S')}
     response = requests.get(settings.RUBIN_SCHEDULE_URL, params=params)
     response.raise_for_status()