diff --git a/CMakeLists.txt b/CMakeLists.txt
index fb87fb76..c38ca8dd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required (VERSION 2.8.11)
 project (rai)
 
 if (WIN32)
-	set (PLATFORM_COMPILE_FLAGS "-D_WIN32_WINNT=0x0501 -DWINVER=0x0501")
+	set (PLATFORM_COMPILE_FLAGS "-D_WIN32_WINNT=0x0501 -DWINVER=0x0501 -DWIN32_LEAN_AND_MEAN")
 else (WIN32)
 	set (PLATFORM_COMPILE_FLAGS -fPIC)
 endif (WIN32)