diff --git a/sys/kern/kern_switch.c b/sys/kern/kern_switch.c
index d41974e9d549..a2fb0d8d2f58 100644
--- a/sys/kern/kern_switch.c
+++ b/sys/kern/kern_switch.c
@@ -473,8 +473,10 @@ critical_exit(void)
 int
 maybe_preempt(struct thread *td)
 {
+#ifdef PREEMPTION
 	struct thread *ctd;
 	int cpri, pri;
+#endif
 
 	mtx_assert(&sched_lock, MA_OWNED);
 #ifdef PREEMPTION