diff --git a/rtc_plugins.cpp b/rtc_plugins.cpp
index b18e7b2..5b81cd9 100644
--- a/rtc_plugins.cpp
+++ b/rtc_plugins.cpp
@@ -31,7 +31,7 @@ int initRecv(const char* destRoomId, const char* srcUserId, const int16_t destCh
         return -1;
     }
 }
-int initSend(const char* srcRoomId, const char* destRoomId, const int16_t destChannelIndex, const uint8_t channelNum) {
+int initSend(const char* srcRoomId, const char* destRoomId, const int16_t destChannelIndex, const int16_t channelNum) {
     bool res = RTCContext::instance().initSend(srcRoomId, destRoomId, destChannelIndex, channelNum);
     if (res) {
         return 0;
diff --git a/util/RTCContext.cpp b/util/RTCContext.cpp
index 768ae3c..fb62dce 100644
--- a/util/RTCContext.cpp
+++ b/util/RTCContext.cpp
@@ -277,7 +277,7 @@ bool RTCContext::initRecv(const char* destRoomId, const char* srcUserId, const i
     return true;
 
 }
-bool RTCContext::initSend(const char* srcRoomId, const char* destRoomId, const int16_t destChannelIndex, uint8_t channelNum)
+bool RTCContext::initSend(const char* srcRoomId, const char* destRoomId, const uint8_t destChannelIndex, uint8_t channelNum)
 {
     while (!isOnRoom_)
     {
diff --git a/util/RTCContext.h b/util/RTCContext.h
index 3823ae1..e2c079e 100644
--- a/util/RTCContext.h
+++ b/util/RTCContext.h
@@ -84,7 +84,7 @@ public:
     mrtc::IMRTCEngine* getRtcEngine() const;
     bool init(const char* selfUserId, const char* selfDisplayName, const char* selfRoomId);
     bool initRecv(const char* destRoomId, const char* srcUserId, const int16_t destChannelIndex);
-    bool initSend(const char* srcRoomId, const char* destRoomId, const int16_t destChannelIndex, uint8_t channelNum);
+    bool initSend(const char* srcRoomId, const char* destRoomId, const uint8_t destChannelIndex, uint8_t channelNum);
     bool initGIL();
 
     void* getpData() const;