diff --git a/thirdparty/src/Lua/loadlib.cpp b/thirdparty/src/Lua/loadlib.cpp
index a20e68efc..f5319da42 100644
--- a/thirdparty/src/Lua/loadlib.cpp
+++ b/thirdparty/src/Lua/loadlib.cpp
@@ -176,6 +176,8 @@ static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
 ** =======================================================================
 */
 
+#define WIN32_LEAN_AND_MEAN
+
 #include <windows.h>
 
 #undef setprogdir