diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7b622422..46315d96 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -109,6 +109,7 @@ if(WIN32)
 
     if(MINGW)
         if(NANA_CMAKE_ENABLE_MINGW_STD_THREADS_WITH_MEGANZ)
+            add_definitions(-DSTD_THREAD_NOT_SUPPORTED)
             add_definitions(-DNANA_ENABLE_MINGW_STD_THREADS_WITH_MEGANZ)
         endif(NANA_CMAKE_ENABLE_MINGW_STD_THREADS_WITH_MEGANZ)
     endif(MINGW)
diff --git a/include/nana/std_mutex.hpp b/include/nana/std_mutex.hpp
index b508548e..38c07aaf 100644
--- a/include/nana/std_mutex.hpp
+++ b/include/nana/std_mutex.hpp
@@ -8,12 +8,12 @@
 #include <windows.h>
 #include <mutex>
 #include <condition_variable>
-#include <thread>
-#include <pthread.h>
+//#include <thread>
+//#include <pthread.h>
 #include <errno.h>
 #include <cstdio>
 // http://lxr.free-electrons.com/source/include/uapi/asm-generic/errno.h#L53
-#define EPROTO          71      /* Protocol error */
+//#define EPROTO          71      /* Protocol error */
 #include <mingw.thread.h>
 #include <mingw.mutex.h>
 #else