diff --git a/src/win32/i_mouse.cpp b/src/win32/i_mouse.cpp
index 100a1836c..b41693664 100644
--- a/src/win32/i_mouse.cpp
+++ b/src/win32/i_mouse.cpp
@@ -8,6 +8,7 @@
 
 #define WIN32_LEAN_AND_MEAN
 #define DIRECTINPUT_VERSION 0x800
+#define _WIN32_WINNT 0x0501
 #include <windows.h>
 #include <dinput.h>