diff --git a/tiramisu_json_api/api.py b/tiramisu_json_api/api.py
index 980d4e9..1176951 100644
--- a/tiramisu_json_api/api.py
+++ b/tiramisu_json_api/api.py
@@ -100,7 +100,7 @@ class TiramisuOptionOption:
             props.append('mandatory')
         if model.get('readOnly'):
             props.append('frozen')
-        if self.config.get_hidden(this._path):
+        if self.config.get_hidden(self._path):
             props.append('hidden')
         if self.form.get(self._path, {}).get('clearable'):
             props.append('clearable')