diff --git a/nixos/modules/services/torrent/transmission.nix b/nixos/modules/services/torrent/transmission.nix
index 412f9180375c..f7a88867b616 100644
--- a/nixos/modules/services/torrent/transmission.nix
+++ b/nixos/modules/services/torrent/transmission.nix
@@ -71,7 +71,7 @@ in
       };
 
       downloadDirPermissions = mkOption {
-        type = types.string;
+        type = types.str;
         default = "770";
         example = "775";
         description = ''