diff --git a/artiq/management/scheduler.py b/artiq/management/scheduler.py
index 61f88b24b..407b6bdea 100644
--- a/artiq/management/scheduler.py
+++ b/artiq/management/scheduler.py
@@ -115,3 +115,5 @@ class Scheduler:
                     ],
                     timeout=next_periodic,
                     return_when=asyncio.FIRST_COMPLETED)
+                for t in pend:
+                    t.cancel()