diff --git a/MdePkg/Include/Protocol/AcpiSupport.h b/MdePkg/Include/Protocol/AcpiSupport.h
index 8602b67f85..790cdf2b3e 100644
--- a/MdePkg/Include/Protocol/AcpiSupport.h
+++ b/MdePkg/Include/Protocol/AcpiSupport.h
@@ -168,6 +168,6 @@ struct _EFI_ACPI_SUPPORT_PROTOCOL {
 //
 // Extern the GUID for protocol users.
 //
-extern EFI_GUID gEfiAcpiSupportGuid;
+extern EFI_GUID gEfiAcpiSupportProtocolGuid;
 
 #endif
diff --git a/MdePkg/Include/Protocol/BootScriptSave.h b/MdePkg/Include/Protocol/BootScriptSave.h
index 496f79f012..4dff3a9b0a 100644
--- a/MdePkg/Include/Protocol/BootScriptSave.h
+++ b/MdePkg/Include/Protocol/BootScriptSave.h
@@ -105,6 +105,6 @@ struct _EFI_BOOT_SCRIPT_SAVE_PROTOCOL {
   EFI_BOOT_SCRIPT_CLOSE_TABLE CloseTable;
 };
 
-extern EFI_GUID gEfiBootScriptSaveGuid;
+extern EFI_GUID gEfiBootScriptSaveProtocolGuid;
 
 #endif