diff --git a/CMakeLists.txt b/CMakeLists.txt
index 846322b1..7fd567b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,6 +58,7 @@ endif ()
 add_definitions(-DTYRUTILS_VERSION=${GIT_DESCRIBE})
 
 if (MSVC)
+	add_definitions("/DWIN32")
 	# TODO: remove these 
 	add_definitions("/D_CRT_SECURE_NO_WARNINGS")
 	add_definitions("/wd4244") # disable "conversion from .. to .., possible loss of data" warning