diff --git a/UmaUmaChecker/src/Log/Log.h b/UmaUmaChecker/src/Log/Log.h
index 2ba93c6..7a2b4fe 100644
--- a/UmaUmaChecker/src/Log/Log.h
+++ b/UmaUmaChecker/src/Log/Log.h
@@ -1,7 +1,5 @@
 #pragma once
 
-#define BOOST_USE_WINAPI_VERSION BOOST_WINAPI_VERSION_WIN7
-
 #include <boost/log/expressions.hpp>
 #include <boost/log/trivial.hpp>
 #include <boost/log/sinks/text_file_backend.hpp>