diff --git a/include/hidusage.h b/include/hidusage.h
index 268ee4d05e8..fc77dff2c6b 100644
--- a/include/hidusage.h
+++ b/include/hidusage.h
@@ -198,6 +198,8 @@ typedef USHORT USAGE, *PUSAGE;
 #define HID_USAGE_PAGE_DIGITIZER          ((USAGE) 0x0D)
 #define HID_USAGE_PAGE_UNICODE            ((USAGE) 0x10)
 #define HID_USAGE_PAGE_ALPHANUMERIC       ((USAGE) 0x14)
+#define HID_USAGE_PAGE_VENDOR_DEFINED_BEGIN ((USAGE) 0xff00)
+#define HID_USAGE_PAGE_VENDOR_DEFINED_END   ((USAGE) 0xffff)
 
 #define HID_USAGE_SIMULATION_RUDDER       ((USAGE) 0xBA)
 #define HID_USAGE_SIMULATION_THROTTLE     ((USAGE) 0xBB)