diff --git a/make/tls.mk b/make/tls.mk
index 4b779a0..2aaf026 100644
--- a/make/tls.mk
+++ b/make/tls.mk
@@ -56,7 +56,7 @@ remove_/etc/periodic/daily/tls-%.joeac.net:
 	rm -f $(@:remove_%=%)
 
 .PHONY: delete_cert_%
-delete_cert_%
+delete_cert_%:
 	sudo certbot delete --cert-name $(@:delete_cert_%=%).joeac.net
 
 /etc/periodic/daily/tls-%joeac.net: