diff --git a/src/Rtmp/RtmpProtocol.cpp b/src/Rtmp/RtmpProtocol.cpp
index 47439b4f..ee391b61 100644
--- a/src/Rtmp/RtmpProtocol.cpp
+++ b/src/Rtmp/RtmpProtocol.cpp
@@ -8,11 +8,13 @@
  * may be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <algorithm>
 #include "RtmpProtocol.h"
 #include "Rtmp/utils.h"
 #include "RtmpMediaSource.h"
-using namespace toolkit;
+
 using namespace std;
+using namespace toolkit;
 
 #define C1_DIGEST_SIZE 32
 #define C1_KEY_SIZE 128
@@ -752,7 +754,7 @@ void RtmpProtocol::handle_chunk(RtmpPacket::Ptr packet) {
 
         case MSG_WIN_SIZE: {
             //如果窗口太小，会导致发送sendAcknowledgement时无限递归：https://github.com/ZLMediaKit/ZLMediaKit/issues/1839
-            _windows_size = std::max(load_be32(&chunk_data.buffer[0]), 32 * 1024U);
+            _windows_size = max(load_be32(&chunk_data.buffer[0]), 32 * 1024U);
             TraceL << "MSG_WIN_SIZE:" << _windows_size;
             break;
         }