diff --git a/MdePkg/Include/IndustryStandard/Usb.h b/MdePkg/Include/IndustryStandard/Usb.h
index d3328a5461..56f94d8fc2 100644
--- a/MdePkg/Include/IndustryStandard/Usb.h
+++ b/MdePkg/Include/IndustryStandard/Usb.h
@@ -76,8 +76,8 @@
 // USB transation direction
 //
 typedef enum {
-  EfiUsbDataOut,
   EfiUsbDataIn,
+  EfiUsbDataOut,
   EfiUsbNoData
 } EFI_USB_DATA_DIRECTION;