diff --git a/spec/focus/nextcloud.nix b/spec/focus/nextcloud.nix
index 94f32236..da47afcc 100644
--- a/spec/focus/nextcloud.nix
+++ b/spec/focus/nextcloud.nix
@@ -22,6 +22,8 @@ in {
     config.adminpassFile = builtins.toString (pkgs.writeText "password" "initial_password");
     extraOptions.overwriteprotocol = "https";
     extraOptions.default_phone_region = "US";
+    extraOptions.default_language = "zh";
+    extraOptions.default_locale = "zh_Hans_CN";
     caching.redis = true;
     phpOptions.upload_max_filesize = "128G";
     phpOptions.post_max_size = "128G";