--- a/Makefile
+++ b/Makefile
@@ -426,19 +426,19 @@
 
 ## Man pages
 $(MAN_PATH)/man1/$(AGENT).1: $(MANDIR)/$(AGENT).1 $(MAN_PATH)/man1
-	@install $< $@
+	@install -m 644 $< $@
 $(MAN_PATH)/man1/$(GEN).1: $(MANDIR)/$(GEN).1 $(MAN_PATH)/man1
-	@install $< $@
+	@install -m 644 $< $@
 $(MAN_PATH)/man1/$(ADD).1: $(MANDIR)/$(ADD).1 $(MAN_PATH)/man1
-	@install $< $@
+	@install -m 644 $< $@
 $(MAN_PATH)/man1/$(CLIENT).1: $(MANDIR)/$(CLIENT).1 $(MAN_PATH)/man1
-	@install $< $@
+	@install -m 644 $< $@
 $(MAN_PATH)/man1/$(AGENT_SERVICE).1: $(MANDIR)/$(AGENT_SERVICE).1 $(MAN_PATH)/man1
-	@install $< $@
+	@install -m 644 $< $@
 $(MAN_PATH)/man1/$(KEYCHAIN).1: $(MANDIR)/$(KEYCHAIN).1 $(MAN_PATH)/man1
-	@install $< $@
+	@install -m 644 $< $@
 $(PROMPT_MAN_PATH)/man1/$(PROMPT).1: $(MANDIR)/$(PROMPT).1 $(PROMPT_MAN_PATH)/man1
-	@install $< $@
+	@install -m 644 $< $@
 
 
 ## Lib
@@ -452,24 +452,24 @@
 	@ln -sf $(SHARED_LIB_NAME_SO) $@
 
 $(INCLUDE_PATH)/oidc-agent/api.h: $(SRCDIR)/$(CLIENT)/api.h $(INCLUDE_PATH)/oidc-agent
-	@install $< $@
+	@install -m 644 $< $@
 
 $(INCLUDE_PATH)/oidc-agent/ipc_values.h: $(SRCDIR)/defines/ipc_values.h $(INCLUDE_PATH)/oidc-agent
-	@install $< $@
+	@install -m 644 $< $@
 
 $(INCLUDE_PATH)/oidc-agent/oidc_error.h: $(SRCDIR)/utils/oidc_error.h $(INCLUDE_PATH)/oidc-agent
-	@install $< $@
+	@install -m 644 $< $@
 
 $(LIBDEV_PATH)/liboidc-agent.a: $(APILIB)/liboidc-agent.a $(LIBDEV_PATH)
-	@install $< $@
+	@install -m 644 $< $@
 
 $(INCLUDE_PATH)/oidc-agent/export_symbols.h: $(SRCDIR)/$(CLIENT)/export_symbols.h $(INCLUDE_PATH)/oidc-agent
-	@install $< $@
+	@install -m 644 $< $@
 
 
 ## scheme handler
 $(DESKTOP_APPLICATION_PATH)/oidc-gen.desktop: $(CONFDIR)/scheme_handler/oidc-gen.desktop
-	@install -D $< $@
+	@install -m 644 -D $< $@
 	@echo "Exec=x-terminal-emulator -e bash -c \"$(BIN_AFTER_INST_PATH)/bin/$(GEN) --codeExchange=%u; exec bash\"" >> $@
 
 ## Xsession
