diff --git a/include/libopencm3/usb/dfu.h b/include/libopencm3/usb/dfu.h
index b7f028c0..1d0fc3f1 100644
--- a/include/libopencm3/usb/dfu.h
+++ b/include/libopencm3/usb/dfu.h
@@ -38,6 +38,8 @@ LGPL License Terms @ref lgpl_license
 #ifndef __DFU_H
 #define __DFU_H
 
+#define USB_CLASS_DFU 0xFE
+
 enum dfu_req {
 	DFU_DETACH,
 	DFU_DNLOAD,