diff --git a/util/RTCContext.cpp b/util/RTCContext.cpp
index c340769..4098315 100644
--- a/util/RTCContext.cpp
+++ b/util/RTCContext.cpp
@@ -39,6 +39,7 @@ void RTCContext::onSoundLevelUpdate(const char* roomId, const char* peerId, uint
 void RTCContext::onAudioProcess(const char* roomId, const char* peerId,
                                 mrtc::MRTCAudioFrame& audioFrame, mrtc::MRTCAudioSourceType audioSourceType)
 {
+    namespace py = boost::python;
     std::cout << "-----------------------------------" << std::endl;
     std::cout << "dataCount:" << audioFrame.dataCount << audioSourceType;
     if (!py_callback_.is_none()) {