diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 4b585e0fdd22..0f60b08a4f07 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -633,10 +633,14 @@ int ntp_validate_timex(struct timex *txc)
 	if ((txc->modes & ADJ_SETOFFSET) && (!capable(CAP_SYS_TIME)))
 		return -EPERM;
 
-	if (txc->modes & ADJ_FREQUENCY) {
-		if (LONG_MIN / PPM_SCALE > txc->freq)
+	/*
+	 * Check for potential multiplication overflows that can
+	 * only happen on 64-bit systems:
+	 */
+	if ((txc->modes & ADJ_FREQUENCY) && (BITS_PER_LONG == 64)) {
+		if (LLONG_MIN / PPM_SCALE > txc->freq)
 			return -EINVAL;
-		if (LONG_MAX / PPM_SCALE < txc->freq)
+		if (LLONG_MAX / PPM_SCALE < txc->freq)
 			return -EINVAL;
 	}