Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 842281e..ee7fbe6 100644
--- a/Makefile
+++ b/Makefile
@@ -112,9 +112,9 @@ install: tree
 	install -d $(BINDIR)
 	install -d $(MANDIR)
 	if [ -e $(TREE_DEST) ]; then \
-		install $(TREE_DEST) $(BINDIR)/$(TREE_DEST); \
+		install -p $(TREE_DEST) $(BINDIR)/$(TREE_DEST); \
 	fi
-	install doc/$(MAN) $(MANDIR)/$(MAN)
+	install -p doc/$(MAN) $(MANDIR)/$(MAN)
 
 distclean:
 	if [ -f tree.o ]; then rm *.o; fi