diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 406dccb79c2b6..502e1e5b7f7f6 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -727,10 +727,10 @@ static inline void process_adjtimex_modes(const struct __kernel_timex *txc,
 	}
 
 	if (txc->modes & ADJ_MAXERROR)
-		time_maxerror = txc->maxerror;
+		time_maxerror = clamp(txc->maxerror, 0, NTP_PHASE_LIMIT);
 
 	if (txc->modes & ADJ_ESTERROR)
-		time_esterror = txc->esterror;
+		time_esterror = clamp(txc->esterror, 0, NTP_PHASE_LIMIT);
 
 	if (txc->modes & ADJ_TIMECONST) {
 		time_constant = txc->constant;