diff --git a/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py b/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py
index dd1e52b84..efcc99e95 100644
--- a/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py
+++ b/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py
@@ -55,8 +55,8 @@ def split(path, all_files: bool, splitter):
         # Filter out hidden filenames, hidden directories, and excluded directories,
         # unless "all files" are requested
         if not all_files:
-            subdirs[:] = [d for d in subdirs if not (d[0] == '.' or d in EXCLUDE_DIRS)]
-            filenames = [f for f in filenames if not f[0] == '.']
+            subdirs[:] = [d for d in subdirs if not (d[0] == "." or d in EXCLUDE_DIRS)]
+            filenames = [f for f in filenames if not f[0] == "."]
 
         for filename in filenames:
             filepath = Path(os.path.join(dir, filename))