diff --git a/webrtc/WebRtcTransport.cpp b/webrtc/WebRtcTransport.cpp
index ccaaaddb..7bf117ee 100644
--- a/webrtc/WebRtcTransport.cpp
+++ b/webrtc/WebRtcTransport.cpp
@@ -346,7 +346,7 @@ void WebRtcTransport::sendRtpPacket(const char *buf, int len, bool flush, void *
         auto pkt = _packet_pool.obtain2();
         // 预留rtx加入的两个字节
         pkt->setCapacity((size_t)len + SRTP_MAX_TRAILER_LEN + 2);
-        pkt->assign(buf, len);
+        memcpy(pkt->data(), buf, len);
         onBeforeEncryptRtp(pkt->data(), len, ctx);
         if (_srtp_session_send->EncryptRtp(reinterpret_cast<uint8_t *>(pkt->data()), &len)) {
             pkt->setSize(len);