diff --git a/sys/kern/subr_intr.c b/sys/kern/subr_intr.c
--- a/sys/kern/subr_intr.c
+++ b/sys/kern/subr_intr.c
@@ -534,6 +534,10 @@
 		isrc_release_counters(isrc);
 	error = isrc_free_irq(isrc);
 	mtx_unlock(&isrc_table_lock);
+
+	if (isrc->isrc_event != NULL)
+		intr_event_destroy(isrc->isrc_event);
+
 	return (error);
 }