diff --git a/make/tls.mk b/make/tls.mk
index 72608a3..e7c3f2c 100644
--- a/make/tls.mk
+++ b/make/tls.mk
@@ -31,7 +31,7 @@ endef
 define obtain_or_renew_cert_cmd =
 sudo certbot certonly \
 	--nginx \
-	--cert-name $(subdomain) \
+	--cert-name $(subdomain).joeac.net \
 	--domain $(subst @.,,$(subdomain).)joeac.net
 endef