diff --git a/sys/kern/kern_intr.c b/sys/kern/kern_intr.c
--- a/sys/kern/kern_intr.c
+++ b/sys/kern/kern_intr.c
@@ -589,7 +589,7 @@
 	ithread->it_flags |= IT_DEAD;
 	if (TD_AWAITING_INTR(td)) {
 		TD_CLR_IWAIT(td);
-		sched_add(td, SRQ_INTR);
+		sched_wakeup(td, SRQ_INTR);
 	} else
 		thread_unlock(td);
 }
@@ -1020,7 +1020,7 @@
 		CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, td->td_proc->p_pid,
 		    td->td_name);
 		TD_CLR_IWAIT(td);
-		sched_add(td, SRQ_INTR);
+		sched_wakeup(td, SRQ_INTR);
 	} else {
 #ifdef HWPMC_HOOKS
 		it->it_waiting++;
diff --git a/sys/kern/kern_timeout.c b/sys/kern/kern_timeout.c
--- a/sys/kern/kern_timeout.c
+++ b/sys/kern/kern_timeout.c
@@ -559,7 +559,7 @@
 			thread_lock_block_wait(td);
 			THREAD_LOCK_ASSERT(td, MA_OWNED);
 			TD_CLR_IWAIT(td);
-			sched_add(td, SRQ_INTR);
+			sched_wakeup(td, SRQ_INTR);
 		} else
 			mtx_unlock_spin_flags(&cc->cc_lock, MTX_QUIET);
 	} else