--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,7 +44,7 @@ project(${PROJECT} CXX)
 ###
 # compilation options
 ###
-IF (WIN32)
+IF (MSVC)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W3 /O2 /bigobj")

   # was causing conflics with gtest build