diff --git a/objectifier-module.nix b/objectifier-module.nix
index d22476d..9c4fd92 100644
--- a/objectifier-module.nix
+++ b/objectifier-module.nix
@@ -80,7 +80,7 @@ in {
         in (concatStringsSep " " [
           "gunicorn"
           bindClause
-          "--workers ${cfg.workers}"
+          "--workers ${toString cfg.workers}"
           "-k uvicorn.workers.UvicornWorker"
           "--pid /run/objectifier.pid"
           "objectifier:app"