diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1121345..babb172 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,7 +40,7 @@ else()
 endif()
 
 if(MSVC)
-    add_definitions("/Zc:__cplusplus")  # define __cplusplus value correctly
+#     add_definitions("/Zc:__cplusplus")  # define __cplusplus value correctly
     add_definitions("/utf-8")           # enable to use u8"" literal
     if(MSVC_VERSION LESS 1910)
         message(STATUS "MSVC < 1910. DEFINE_CONVERSION_NON_INTRUSIVE is disabled")