diff --git a/sys/autoconf/Makefile.utl b/sys/autoconf/Makefile.utl
index 113b1d7..c67cb68 100644
--- a/sys/autoconf/Makefile.utl
+++ b/sys/autoconf/Makefile.utl
@@ -238,7 +238,7 @@ lev_lex.o:   lev_lex.c $(HACK_H) ../include/lev_comp.h ../include/sp_lev.h
 lev_yacc.c: $(srcdir)/lev_comp.y
 	$(YACC) $(YACCDIST) -b lev -d $(srcdir)/lev_comp.y
 	mv lev$(YTABC) lev_yacc.c
-	mv lev$(YTABH) ../include/lev_comp.h
+	cp lev$(YTABH) ../include/lev_comp.h
 
 lev_lex.c: $(srcdir)/lev_comp.l
 	rm -f lev_$(LEXYYC)
@@ -269,7 +269,7 @@ dgn_lex.o:   dgn_lex.c $(CONFIG.H) ../include/dgn_comp.h ../include/dgn_file.h
 dgn_yacc.c: $(srcdir)/dgn_comp.y
 	$(YACC) $(YACCDIST) -b dgn -d $(srcdir)/dgn_comp.y
 	mv dgn$(YTABC) dgn_yacc.c
-	mv dgn$(YTABH) ../include/dgn_comp.h
+	cp dgn$(YTABH) ../include/dgn_comp.h
 
 dgn_lex.c: $(srcdir)/dgn_comp.l
 	rm -f dgn_$(LEXYYC)