diff --git a/src/drivers/kinetis/tone_alarm/tone_alarm.cpp b/src/drivers/kinetis/tone_alarm/tone_alarm.cpp
index 4d1e942891..a005b35b85 100644
--- a/src/drivers/kinetis/tone_alarm/tone_alarm.cpp
+++ b/src/drivers/kinetis/tone_alarm/tone_alarm.cpp
@@ -425,7 +425,6 @@ void ToneAlarm::next_note()
 	}
 
 	// and arrange a callback when the note should stop
-	assert(duration != 0);
 	work_queue(HPWORK, &_work, (worker_t)&ToneAlarm::next_trampoline, this, USEC2TICK(duration));
 }