diff --git a/fastapi_hypermodel/base/hypermodel.py b/fastapi_hypermodel/base/hypermodel.py
index 200b6c3..3080cc8 100644
--- a/fastapi_hypermodel/base/hypermodel.py
+++ b/fastapi_hypermodel/base/hypermodel.py
@@ -58,7 +58,8 @@ def _get_uri_path(
         if templated and isinstance(route, Route):
             return UrlType(route.path)
 
-        params = resolve_param_values(params, values)
+        internal_params = resolve_param_values(params, values)
+        params |= internal_params
         return UrlType(app.url_path_for(endpoint, **params))