diff --git a/corrlib/initialization.py b/corrlib/initialization.py
index fd1ad07..b46010a 100644
--- a/corrlib/initialization.py
+++ b/corrlib/initialization.py
@@ -57,7 +57,7 @@ def _create_config(path: str) -> None:
     return
 
 
-def create(path: str, tracker = 'datalad') -> None:
+def create(path: str, tracker: str = 'datalad') -> None:
     """
     Create folder of backlogs.