diff --git a/BaseTools/Source/Python/AutoGen/GenC.py b/BaseTools/Source/Python/AutoGen/GenC.py
index 0fb6b9fc4e..542edb3ce2 100644
--- a/BaseTools/Source/Python/AutoGen/GenC.py
+++ b/BaseTools/Source/Python/AutoGen/GenC.py
@@ -1203,15 +1203,16 @@ def CreateLibraryPcdCode(Info, AutoGenC, AutoGenH, Pcd):
         else:
             AutoGenH.Append('extern volatile  %s  %s%s;\n' % (DatumType, PcdVariableName, Array))
         AutoGenH.Append('#define %s  %s_gPcd_BinaryPatch_%s\n' %(GetModeName, Type, TokenCName))
+        PcdDataSize = GetPcdSize(Pcd)
         if Pcd.DatumType == 'VOID*':
             AutoGenH.Append('#define %s(SizeOfBuffer, Buffer)  LibPatchPcdSetPtrAndSize((VOID *)_gPcd_BinaryPatch_%s, &_gPcd_BinaryPatch_Size_%s, (UINTN)_PCD_PATCHABLE_%s_SIZE, (SizeOfBuffer), (Buffer))\n' % (SetModeName, TokenCName, TokenCName, TokenCName))
             AutoGenH.Append('#define %s(SizeOfBuffer, Buffer)  LibPatchPcdSetPtrAndSizeS((VOID *)_gPcd_BinaryPatch_%s, &_gPcd_BinaryPatch_Size_%s, (UINTN)_PCD_PATCHABLE_%s_SIZE, (SizeOfBuffer), (Buffer))\n' % (SetModeStatusName, TokenCName, TokenCName, TokenCName))
+            AutoGenH.Append('#define %s %s\n' % (PatchPcdSizeTokenName, Pcd.MaxDatumSize))
         else:
             AutoGenH.Append('#define %s(Value)  (%s = (Value))\n' % (SetModeName, PcdVariableName))
             AutoGenH.Append('#define %s(Value)  ((%s = (Value)), RETURN_SUCCESS)\n' % (SetModeStatusName, PcdVariableName))
-        
-        PcdDataSize = GetPcdSize(Pcd)
-        AutoGenH.Append('#define %s %s\n' % (PatchPcdSizeTokenName, PcdDataSize))
+            AutoGenH.Append('#define %s %s\n' % (PatchPcdSizeTokenName, PcdDataSize))
+
         AutoGenH.Append('#define %s %s\n' % (GetModeSizeName,PatchPcdSizeVariableName))
         AutoGenH.Append('extern UINTN %s; \n' % PatchPcdSizeVariableName)