diff --git a/windows_cygwin/build.bat b/windows_cygwin/build.bat
index 4a3bbd6b..fc81ad80 100644
--- a/windows_cygwin/build.bat
+++ b/windows_cygwin/build.bat
@@ -8,8 +8,9 @@ set bash=c:\cygwin64\bin\bash.exe --login -c
 for /f "delims=" %%A in ('%bash% "cd `cygpath $HOMEPATH`/dev/dotfiles && git rev-parse --abbrev-ref HEAD"') do set "branch=%%A" 
 %bash% 'echo "branch is $branch"'
 %bash% "cp -vr `cygpath $HOMEPATH`/.ssh $HOME/"
-%bash% "mkdir -pv $HOME/dev/"
 
+%bash% "mkdir -pv $HOME/dev/"
+%bash% "rm -fr $HOME/dev/dotfiles"
 %bash% "git clone `cygpath $HOMEPATH`/dev/dotfiles $HOME/dev/dotfiles"
 %bash% "cd $HOME/dev/dotfiles && git checkout $branch"
 %bash% "export DIR=$HOME/dev/dotfiles && export NOSUDO=true && export DONT_CHANGE_SHELL=true && bash $DIR/common/configure_fresh_system"