diff --git a/rtmp/rtmp.go b/rtmp/rtmp.go
index 323d917e..2240ef95 100644
--- a/rtmp/rtmp.go
+++ b/rtmp/rtmp.go
@@ -139,7 +139,7 @@ const (
 
 // memmove copies n bytes from "from" to "to".
 //go:linkname memmove runtime.memmove
-//func memmove(to, from unsafe.Pointer, n uintptr)
+func memmove(to, from unsafe.Pointer, n uintptr)
 
 // av_setDataFrame is a static const global in rtmp.c
 var setDataFrame = AVC("@setDataFrame")
@@ -515,7 +515,8 @@ func afmEncodeString(output *byte, outend *byte, bv *C.AVal) *byte {
 		outputPtr = unsafe.Pointer(C.AMF_EncodeInt32((*C.char)(outputPtr),
 			(*C.char)(outendPtr), bv.av_len))
 	}
-	C.memcpy(unsafe.Pointer(outputPtr), unsafe.Pointer(bv.av_val), (C.size_t)(bv.av_len))
+	memmove(unsafe.Pointer(outputPtr), unsafe.Pointer(bv.av_val), uintptr(bv.av_len))
+	//C.memcpy(unsafe.Pointer(outputPtr), unsafe.Pointer(bv.av_val), (C.size_t)(bv.av_len))
 	incBytePtr(outputPtr, int(bv.av_len))
 
 	return (*byte)(outputPtr)
@@ -783,11 +784,11 @@ func sendPacket(r *C.RTMP, packet *C.RTMPPacket, queue int) int {
 			(*C.RTMPPacket)(C.malloc(C.size_t(unsafe.Sizeof(*packet))))
 	}
 
-	//memmove(incPtr(unsafe.Pointer(r.m_vecChannelsOut),int(packet.m_nChannel),
-	//int(unsafe.Sizeof(packet))),unsafe.Pointer(packet), unsafe.Sizeof(packet))
-	C.memcpy(unsafe.Pointer(*(**C.RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsOut),
-		int(packet.m_nChannel), int(unsafe.Sizeof(packet))))), unsafe.Pointer(packet),
-		C.size_t(uintptr(unsafe.Sizeof(*packet))))
+	memmove(incPtr(unsafe.Pointer(r.m_vecChannelsOut), int(packet.m_nChannel),
+		int(unsafe.Sizeof(packet))), unsafe.Pointer(packet), unsafe.Sizeof(packet))
+	//C.memcpy(unsafe.Pointer(*(**C.RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsOut),
+	//int(packet.m_nChannel), int(unsafe.Sizeof(packet))))), unsafe.Pointer(packet),
+	//C.size_t(uintptr(unsafe.Sizeof(*packet))))
 	return 1
 }