--- a/debian/rules
+++ b/debian/rules
@@ -15,7 +15,7 @@ MARCH := $(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 GTM_INSTALL_DIR := lib/$(MARCH)/fis-gtm/$(UAPIDIR)
 LOCAL_GTM_INSTALL_DIR := $(CURDIR)/debian/$(BINPKG)/usr/$(GTM_INSTALL_DIR)
 
-export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+export DEB_BUILD_MAINT_OPTIONS = hardening=+all optimize=-lto
 
 %:
 	dh $@