diff --git a/flake.nix b/flake.nix
index 1f29381..3c421b2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -85,7 +85,7 @@
               enable = lib.mkEnableOption "Ascend service";
               bindAddress = lib.mkOption {
                 description = "Bind address (LEPTOS_SITE_ADDR)";
-                type = lib.types.string;
+                type = lib.types.str;
                 default = "127.0.0.1:1337";
               };
             };