diff --git a/odoo-stubs/tests/common.pyi b/odoo-stubs/tests/common.pyi
index 8c72a8b..279f2e4 100644
--- a/odoo-stubs/tests/common.pyi
+++ b/odoo-stubs/tests/common.pyi
@@ -48,6 +48,7 @@ def new_test_user(
     context: dict | None = ...,
     **kwargs
 ) -> Users: ...
+def loaded_demo_data(env: Environment) -> bool: ...
 
 class RecordCapturer:
     def __init__(self, model: BaseModel, domain: list) -> None: ...