diff --git a/mod.nix b/mod.nix
index b0d3379..7af675e 100644
--- a/mod.nix
+++ b/mod.nix
@@ -59,7 +59,7 @@ in
     };
   };
   config = {
-    users.users = mkIf cfg.enable { ${cfg.user} = { }; };
+    users.users = mkIf cfg.enable { ${cfg.user} = { isSystemUser = true; }; };
     systemd.services = mkIf cfg.enable {
       brownpaper-init.script = ''
         mkdir -p '${cfg.dataDir}'