diff --git a/buildscript/modules/winflexbison.cmd b/buildscript/modules/winflexbison.cmd
index 7e0df52a..2f1e9c83 100644
--- a/buildscript/modules/winflexbison.cmd
+++ b/buildscript/modules/winflexbison.cmd
@@ -7,4 +7,8 @@
 @set flexloc=%devroot%\flexbison
 @IF %flexstate%==1 IF NOT EXIST "%devroot%\flexbison\win_flex.exe" set flexloc=%msysloc%\usr\bin
 @IF %flexstate%==1 IF NOT EXIST "%devroot%\flexbison\win_flex.exe" IF NOT EXIST "%msysloc%\usr\bin\flex.exe" set flexstate=0
-@endlocal&set flexstate=%flexstate%&set flexloc=%flexloc%
\ No newline at end of file
+@endlocal&set flexstate=%flexstate%&set flexloc=%flexloc%
+@IF %flexstate%==1 IF "%flexloc%"=="%msysloc%\usr\bin" IF EXIST "%msysloc%\flexbison\" RD /S /Q "%msysloc%\flexbison"
+@IF %flexstate%==1 IF "%flexloc%"=="%msysloc%\usr\bin" ROBOCOPY "%msysloc%\usr" "%msysloc%\flexbison" /E
+@IF %flexstate%==1 IF "%flexloc%"=="%msysloc%\usr\bin" IF EXIST "%msysloc%\flexbison\bin\zstd.exe" del "%msysloc%\flexbison\bin\zstd.exe"
+@IF %flexstate%==1 IF "%flexloc%"=="%msysloc%\usr\bin" set flexloc=%msysloc%\flexbison\bin
\ No newline at end of file