diff --git a/Makefile b/Makefile
index b6d0032..5a683e8 100644
--- a/Makefile
+++ b/Makefile
@@ -45,6 +45,7 @@ bindist: XXMakefile
 	$(MAKE) -f XXMakefile bindist
 
 indent:
+	mv -f config.h config.h-
 #	indent -orig -nce -ncdb -i4 -di1 -nbc *.c *.h
 	indent -orig -nce -ncdb -i4 -di1 -nbc -l79 -ncs -npcs -nfca -ss \
 	   -TAnchor -TAnchorList -TBuffer -TBufferPoint -TBreakpoint \
@@ -69,6 +70,7 @@ indent:
 	   -TURLOption -TURLFile \
 	   -TVector \
 	   *.c *.h
+	mv -f config.h- config.h
 
 XXMakefile: XMakefile config.h
 	awk '/^#ifdef makefile_parameter/,/^#else/' config.h | cat - XMakefile > XXMakefile