diff --git a/BaseTools/Source/C/GenFv/GenFvInternalLib.c b/BaseTools/Source/C/GenFv/GenFvInternalLib.c
index 75cbd3ac17..6a34b6f553 100644
--- a/BaseTools/Source/C/GenFv/GenFvInternalLib.c
+++ b/BaseTools/Source/C/GenFv/GenFvInternalLib.c
@@ -34,10 +34,10 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 #include <Guid/FfsSectionAlignmentPadding.h>
 
+#include "WinNtInclude.h"
 #include "GenFvInternalLib.h"
 #include "FvLib.h"
 #include "PeCoffLib.h"
-#include "WinNtInclude.h"
 
 #define ARMT_UNCONDITIONAL_JUMP_INSTRUCTION       0xEB000000
 #define ARM64_UNCONDITIONAL_JUMP_INSTRUCTION      0x14000000
diff --git a/BaseTools/Source/C/Include/Common/BaseTypes.h b/BaseTools/Source/C/Include/Common/BaseTypes.h
index 39c5408dd4..e1282b3a89 100644
--- a/BaseTools/Source/C/Include/Common/BaseTypes.h
+++ b/BaseTools/Source/C/Include/Common/BaseTypes.h
@@ -122,6 +122,8 @@
 
 #endif
 
+#ifndef GUID_DEFINED
+#define GUID_DEFINED
 ///
 /// 128 bit buffer containing a unique identifier value.
 /// Unless otherwise specified, aligned on a 64 bit boundary.
@@ -132,6 +134,7 @@ typedef struct {
   UINT16  Data3;
   UINT8   Data4[8];
 } GUID;
+#endif
 
 ///
 /// 4-byte buffer. An IPv4 internet protocol address.