diff --git a/MdePkg/Include/Uefi/UefiSpec.h b/MdePkg/Include/Uefi/UefiSpec.h
index 16aef4269b..0f301798cb 100644
--- a/MdePkg/Include/Uefi/UefiSpec.h
+++ b/MdePkg/Include/Uefi/UefiSpec.h
@@ -945,7 +945,7 @@ VOID
   IN EFI_RESET_TYPE           ResetType,
   IN EFI_STATUS               ResetStatus,
   IN UINTN                    DataSize,
-  IN CHAR16                   *ResetData OPTIONAL
+  IN VOID                     *ResetData OPTIONAL
   );
 
 /**