diff --git a/src/Common/Stamp.h b/src/Common/Stamp.h
index f086c2a8..cc2dcae0 100644
--- a/src/Common/Stamp.h
+++ b/src/Common/Stamp.h
@@ -125,12 +125,12 @@ public:
     uint64_t getNtpStamp(uint32_t rtp_stamp, uint32_t sample_rate);
 
 private:
-    void update(uint32_t rtp_stamp, double ntp_stamp_ms);
+    void update(uint32_t rtp_stamp, uint64_t ntp_stamp_ms);
     uint64_t getNtpStamp_l(uint32_t rtp_stamp, uint32_t sample_rate);
 
 private:
     uint32_t _last_rtp_stamp = 0;
-    double _last_ntp_stamp_ms = 0;
+    uint64_t _last_ntp_stamp_ms = 0;
 };
 
 }//namespace mediakit