diff --git a/system/services/calibre.nix b/system/services/calibre.nix
index c1bfd5c..11f914f 100644
--- a/system/services/calibre.nix
+++ b/system/services/calibre.nix
@@ -13,22 +13,22 @@ in {
       default = "phundrak";
     };
     group = mkOption {
-      type = types.string;
+      type = types.str;
       default = "users";
     };
     dataDir = mkOption {
-      type = types.string;
+      type = types.str;
       example = "/tank/calibre/conf";
       default = "/tank/calibre/conf";
     };
     library = mkOption {
-      type = types.string;
+      type = types.str;
       example = "/tank/calibre/library";
       default = "/tank/calibre/library";
     };
   };
   config.services.calibre-web = mkIf cfg.enable {
-    inherit (cfg) enable user group dataDir;
+    inherit (cfg) enable user dataDir group;
     options = {
       calibreLibrary = cfg.library;
       enableBookConversion = true;