diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index 3d62dbb..fddfd35 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -44,6 +44,7 @@
 	UCLASS_USB,		/* USB bus */
 	UCLASS_USB_HUB,		/* USB hub */
 	UCLASS_USB_DEV_GENERIC,	/* USB generic device */
+	UCLASS_MASS_STORAGE,	/* Mass storage device */
 
 	UCLASS_COUNT,
 	UCLASS_INVALID = -1,