diff --git a/sys/kern/kern_timeout.c b/sys/kern/kern_timeout.c
index d0fb19661fa4..bb981f423c7c 100644
--- a/sys/kern/kern_timeout.c
+++ b/sys/kern/kern_timeout.c
@@ -430,6 +430,7 @@ callout_get_bucket(sbintime_t sbt)
 void
 callout_process(sbintime_t now)
 {
+	struct intr_entropy entropy;
 	struct callout *tmp, *tmpn;
 	struct callout_cpu *cc;
 	struct callout_list *sc;
@@ -545,6 +546,10 @@ callout_process(sbintime_t now)
 	avg_lockcalls_dir += (lockcalls_dir * 1000 - avg_lockcalls_dir) >> 8;
 #endif
 	if (!TAILQ_EMPTY(&cc->cc_expireq)) {
+		entropy.event = (uintptr_t)cc;
+		entropy.td = curthread;
+		random_harvest_queue(&entropy, sizeof(entropy), RANDOM_SWI);
+
 		td = cc->cc_thread;
 		if (TD_AWAITING_INTR(td)) {
 			thread_lock_block_wait(td);