diff --git a/subsys/net/lib/ptp/clock.c b/subsys/net/lib/ptp/clock.c
index 2db8d1366ad..c88edffacfd 100644
--- a/subsys/net/lib/ptp/clock.c
+++ b/subsys/net/lib/ptp/clock.c
@@ -529,8 +529,8 @@ void ptp_clock_synchronize(uint64_t ingress, uint64_t egress)
 
 		ptp_clock_get(ptp_clk.phc, &current);
 
-		current.second -= (uint64_t)(offset / NSEC_PER_SEC);
-		dest_nsec = (int32_t)(current.nanosecond - (uint32_t)(offset % NSEC_PER_SEC));
+		current.second = (uint64_t)(current.second - (offset / NSEC_PER_SEC));
+		dest_nsec = (int32_t)(current.nanosecond - (offset % NSEC_PER_SEC));
 
 		if (dest_nsec < 0) {
 			current.second--;