diff --git a/MdeModulePkg/Universal/DevicePathDxe/DevicePathToText.c b/MdeModulePkg/Universal/DevicePathDxe/DevicePathToText.c
index 9c1b9b8506..0ba2a25618 100644
--- a/MdeModulePkg/Universal/DevicePathDxe/DevicePathToText.c
+++ b/MdeModulePkg/Universal/DevicePathDxe/DevicePathToText.c
@@ -17,7 +17,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 STATIC
 EFI_DEVICE_PATH_PROTOCOL *
 UnpackDevicePath (
-  IN EFI_DEVICE_PATH_PROTOCOL  *DevPath
+  IN CONST EFI_DEVICE_PATH_PROTOCOL  *DevPath
   )
 /*++
 
@@ -34,7 +34,7 @@ UnpackDevicePath (
 
 --*/
 {
-  EFI_DEVICE_PATH_PROTOCOL  *Src;
+  CONST EFI_DEVICE_PATH_PROTOCOL  *Src;
   EFI_DEVICE_PATH_PROTOCOL  *Dest;
   EFI_DEVICE_PATH_PROTOCOL  *NewPath;
   UINTN                     Size;