diff --git a/rust/Makefile b/rust/Makefile
index 19255d12..adcdd076 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -119,12 +119,12 @@ install-man:
 install-bash-completion: $(PV_TARGETS)
 	$(INSTALL) -d -m 755 $(DESTDIR)$(BASHCOMPLETIONDIR)
 	$(foreach target,$(PV_TARGETS),\
-		$(INSTALL) $(shell find $(shell ls --sort=time --reverse --directory target/release/build/$(target)-*/out/ |tail -n1) -name '*.bash') $(DESTDIR)$(BASHCOMPLETIONDIR);)
+		$(INSTALL) -m 0644 --preserve-timestamps -- $(shell find $(shell ls --sort=time --reverse --directory target/release/build/$(target)-*/out/ |tail -n1) -name '*.bash') $(DESTDIR)$(BASHCOMPLETIONDIR);)
 
 install-zsh-completion: $(PV_TARGETS)
 	$(INSTALL) -d -m 755 $(DESTDIR)$(ZSHCOMPLETIONDIR)
 	$(foreach target,$(PV_TARGETS),\
-		$(INSTALL) $(shell find $(shell ls --sort=time --reverse --directory target/release/build/$(target)-*/out/ |tail -n1) -regex '.*/_[a-zA-Z0-9]+') $(DESTDIR)$(ZSHCOMPLETIONDIR);)
+		$(INSTALL) -m 0644 --preserve-timestamps -- $(shell find $(shell ls --sort=time --reverse --directory target/release/build/$(target)-*/out/ |tail -n1) -regex '.*/_[a-zA-Z0-9]+') $(DESTDIR)$(ZSHCOMPLETIONDIR);)
 
 .PHONY: all install clean skip-build install-rust-tools print-rust-targets install-man rust-test install-bash-completion install-zsh-completion