diff --git a/Makefile.local b/Makefile.local
index 1744747a..b8186277 100644
--- a/Makefile.local
+++ b/Makefile.local
@@ -36,7 +36,7 @@ install: all notmuch.1.gz
 	done ;
 	install notmuch $(DESTDIR)$(prefix)/bin/
 	install -m0644 notmuch.1.gz $(DESTDIR)$(prefix)/share/man/man1/
-	install contrib/notmuch-completion.bash \
+	install -m0644 contrib/notmuch-completion.bash \
 		$(DESTDIR)$(bash_completion_dir)/notmuch
 
 install-emacs: install emacs