diff --git a/Storage/Disk/Drive.cpp b/Storage/Disk/Drive.cpp
index 4fcf69108..5ef0dac5f 100644
--- a/Storage/Disk/Drive.cpp
+++ b/Storage/Disk/Drive.cpp
@@ -163,6 +163,7 @@ void Drive::get_next_event(const Time &duration_already_passed) {
 	// divide interval, which is in terms of a single rotation of the disk, by rotation speed to
 	// convert it into revolutions per second; this is achieved by multiplying by rotational_multiplier_
 	assert(current_event_.length <= Time(1) && current_event_.length >= Time(0));
+	assert(current_event_.length > duration_already_passed);
 	Time interval = (current_event_.length - duration_already_passed) * rotational_multiplier_;
 	set_next_event_time_interval(interval);
 }