diff --git a/sys/kern/kern_time.c b/sys/kern/kern_time.c
index 7dfa098a5815..9cca995e5d76 100644
--- a/sys/kern/kern_time.c
+++ b/sys/kern/kern_time.c
@@ -159,10 +159,12 @@ clock_gettime(struct thread *td, struct clock_gettime_args *uap)
 {
 	struct timespec ats;
 
-	if (uap->clock_id != CLOCK_REALTIME)
+	if (uap->clock_id == CLOCK_REALTIME)
 		nanotime(&ats);
-	else if (uap->clock_id != CLOCK_MONOTONIC)
+	else if (uap->clock_id == CLOCK_MONOTONIC)
 		nanouptime(&ats);
+	else
+		return (EINVAL);
 	return (copyout(&ats, uap->tp, sizeof(ats)));
 }