diff --git a/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py b/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
index b2f3f6a112..6e1ff7fe04 100644
--- a/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
+++ b/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
@@ -13,6 +13,7 @@ from __future__ import print_function
 from __future__ import absolute_import
 
 import Common.LongFilePathOs as os
+import sys
 from sys import stdout
 from subprocess import PIPE,Popen
 from struct import Struct
@@ -486,7 +487,7 @@ class GenFdsGlobalVariable:
 
             SaveFileOnChange(CommandFile, ' '.join(Cmd), False)
             if IsMakefile:
-                if GlobalData.gGlobalDefines.get("FAMILY") == "MSFT":
+                if sys.platform == "win32":
                     Cmd = ['if', 'exist', Input[0]] + Cmd
                 else:
                     Cmd = ['-test', '-e', Input[0], "&&"] + Cmd