diff --git a/Makefile b/Makefile
index 71e459e1a..be0929009 100644
--- a/Makefile
+++ b/Makefile
@@ -219,6 +219,7 @@ customupdate: all
 	cp -rpL data/*.css $(INSTALL_DIR)/data
 	cp -rpL fonts $(INSTALL_DIR)
 	cp -r resources $(INSTALL_DIR)
+	cp -r frontend $(INSTALL_DIR)
 	mkdir $(INSTALL_DIR)/fonts/host
 	zip -9 -r kindlepdfviewer-$(VERSION).zip $(INSTALL_DIR) launchpad/
 	rm -Rf $(INSTALL_DIR)