diff --git a/hosts/temmie/services/userweb/mail.nix b/hosts/temmie/services/userweb/mail.nix
index 44b4e71..37dc1e2 100644
--- a/hosts/temmie/services/userweb/mail.nix
+++ b/hosts/temmie/services/userweb/mail.nix
@@ -70,6 +70,7 @@
     serviceConfig = {
       User = "nullmailer-user";
       Group = "nullmailer-user";
+      Slice = "system-userweb.slice";
 
       ReadWritePaths = [
         "/var/spool/nullmailer"