diff --git a/pcsx2/USB/usb-pad/dx/dx.h b/pcsx2/USB/usb-pad/dx/dx.h
index d4a61d6167..cbf58df159 100644
--- a/pcsx2/USB/usb-pad/dx/dx.h
+++ b/pcsx2/USB/usb-pad/dx/dx.h
@@ -17,7 +17,11 @@
 
 #include <windows.h>
 #include <stdint.h>
+
+#if !defined(DIRECTINPUT_VERSION)
 #define DIRECTINPUT_VERSION 0x0800
+#endif
+
 #include <dinput.h>
 #include <atomic>
 #include <algorithm>