diff --git a/CMakeLists.txt b/CMakeLists.txt
index bba5a02890..6cb96f8008 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -84,12 +84,14 @@ if(CMAKE_SYSTEM_NAME MATCHES "Linux")
 	set(PLATFORM_LIBS ${PLATFORM_LIBS} pthread)
 endif()
 
-if(WIN32 OR (CMAKE_SYSTEM_NAME MATCHES "MINGW"))
+if(WIN32)
 	set(BUILD_NC false)
-	add_definitions(-D_GNU_SOURCE)
-	add_definitions(-D_POSIX)
-	add_definitions(-D_POSIX_SOURCE)
-	add_definitions(-D__USE_MINGW_ANSI_STDIO)
+	if(MINGW)
+		add_definitions(-D_GNU_SOURCE)
+		add_definitions(-D_POSIX)
+		add_definitions(-D_POSIX_SOURCE)
+		add_definitions(-D__USE_MINGW_ANSI_STDIO)
+	endif()
 endif()
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")