diff --git a/rtmp/rtmp.go b/rtmp/rtmp.go
index 366008f8..a9f715db 100644
--- a/rtmp/rtmp.go
+++ b/rtmp/rtmp.go
@@ -363,7 +363,7 @@ func startSession(rtmp *C.RTMP, u string, timeout uint32) (*C.RTMP, error) {
 	rtmp = rtmpAlloc()
 	rtmpInit(rtmp)
 	rtmp.Link.timeout = connect_timeout
-	if C.RTMP_SetupURL(rtmp, (*C.char)(unsafe.Pointer(goStrToCStr(u)))) == 0 {
+	if rtmpSetupUrl(rtmp, u) == 0 {
 		C.RTMP_Close(rtmp)
 		C.RTMP_Free(rtmp)
 		return nil, errors.New("rtmp startSession: Failed to setup URL!")