diff --git a/Makefile b/Makefile
index 49f397b..177bb03 100644
--- a/Makefile
+++ b/Makefile
@@ -65,7 +65,7 @@ install_scripts: ## Install scipts
 install_scripts: scripts
 	install -Dm755 scripts/beesd $(DESTDIR)$(PREFIX)/sbin/beesd
 	install -Dm644 scripts/beesd.conf.sample $(DESTDIR)/$(ETC_PREFIX)/bees/beesd.conf.sample
-ifneq (SYSTEMD_SYSTEM_UNIT_DIR,)
+ifneq ($(SYSTEMD_SYSTEM_UNIT_DIR),)
 	install -Dm644 scripts/beesd@.service $(DESTDIR)$(SYSTEMD_SYSTEM_UNIT_DIR)/beesd@.service
 endif