diff --git a/CMakeLists.txt b/CMakeLists.txt
index 85ae87a4..4115667c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,15 +5,18 @@ project(glm)
 enable_testing()
 
 add_definitions(-D_CRT_SECURE_NO_WARNINGS)
-#add_definitions(/Za)
-#add_definitions(-pedantic)
-#add_definitions(-S)
-#add_definitions(-s)
-add_definitions(-msse2)
-#add_definitions(-m32)
-#add_definitions(-mfpmath=387)
-#add_definitions(-ffast-math)
-#add_definitions(-O3)
+
+if(CMAKE_COMPILER_IS_GNUCXX)
+	#add_definitions(/Za)
+	#add_definitions(-pedantic)
+	#add_definitions(-S)
+	#add_definitions(-s)
+	add_definitions(-msse2)
+	#add_definitions(-m32)
+	#add_definitions(-mfpmath=387)
+	#add_definitions(-ffast-math)
+	#add_definitions(-O3)
+endif()
 
 include_directories(".")