diff --git a/contrib/CMakeLists.txt b/contrib/CMakeLists.txt
index a5909e8..9c44329 100644
--- a/contrib/CMakeLists.txt
+++ b/contrib/CMakeLists.txt
@@ -18,7 +18,7 @@ find_package(Threads REQUIRED)
 
 get_filename_component(gemmlowp_src ${gemmlowp_SOURCE_DIR} PATH)
 
-if(WIN32)
+if(MSVC)
   # one can enable simd from the cmake command line, ie -DCMAKE_CXX_FLAGS="/arch:AVX2
   add_definitions(-DNOMINMAX -DWIN64 -DWIN32_LEAN_AND_MEAN -DNOGDI)
   add_definitions(/bigobj /nologo /EHsc /GF /MP /Gm- /wd4800 /wd4805 /wd4244)