diff --git a/pkg/sfu/buffer/rtpstats_receiver.go b/pkg/sfu/buffer/rtpstats_receiver.go
index 504de9b3b..eb03b495a 100644
--- a/pkg/sfu/buffer/rtpstats_receiver.go
+++ b/pkg/sfu/buffer/rtpstats_receiver.go
@@ -443,11 +443,11 @@ func (r *RTPStatsReceiver) checkRTPClockSkewForSenderReport(srData *livekit.RTCP
 		return
 	}
 
-	timeSinceLast := time.Duration(srData.NtpTimestamp - r.srNewest.NtpTimestamp).Seconds()
+	timeSinceLast := mediatransportutil.NtpTime(srData.NtpTimestamp).Time().Sub(mediatransportutil.NtpTime(r.srNewest.NtpTimestamp).Time()).Seconds()
 	rtpDiffSinceLast := srData.RtpTimestampExt - r.srNewest.RtpTimestampExt
 	calculatedClockRateFromLast := float64(rtpDiffSinceLast) / timeSinceLast
 
-	timeSinceFirst := time.Duration(srData.NtpTimestamp - r.srFirst.NtpTimestamp).Seconds()
+	timeSinceFirst := mediatransportutil.NtpTime(srData.NtpTimestamp).Time().Sub(mediatransportutil.NtpTime(r.srFirst.NtpTimestamp).Time()).Seconds()
 	rtpDiffSinceFirst := srData.RtpTimestampExt - r.srFirst.RtpTimestampExt
 	calculatedClockRateFromFirst := float64(rtpDiffSinceFirst) / timeSinceFirst