diff --git a/pytorch_lightning/trainer/connectors/env_vars_connector.py b/pytorch_lightning/trainer/connectors/env_vars_connector.py
index ddbd6ee3331b5..8d9f2773f61c1 100644
--- a/pytorch_lightning/trainer/connectors/env_vars_connector.py
+++ b/pytorch_lightning/trainer/connectors/env_vars_connector.py
@@ -18,7 +18,7 @@
 from pytorch_lightning.utilities.argparse import get_init_arguments_and_types, parse_env_variables
 
 
-def defaults_from_env_vars(fn: Callable) -> Callable:
+def _defaults_from_env_vars(fn: Callable) -> Callable:
     """
     Decorator for :class:`~pytorch_lightning.trainer.trainer.Trainer` methods for which
     input arguments should be moved automatically to the correct device.