diff --git a/config.bat b/config.bat
index d647ad5e679..758e4621386 100644
--- a/config.bat
+++ b/config.bat
@@ -312,7 +312,7 @@ sed -f ../msdos/sedlibmk.inp < gnulib.tmp > gnulib.mk
 rm -f gnulib.tmp
 Rem Create directorys in lib/ that MKDIR_P is supposed to create
 Rem but I have no idea how to do that on MS-DOS.
-mkdir lib\sys
+mkdir sys
 Rem Create .d files for new files in lib/ and lib/malloc/
 If Not Exist deps\stamp mkdir deps
 for %%f in (*.c) do @call ..\msdos\depfiles.bat %%f