diff --git a/datasette/app.py b/datasette/app.py
index 9d84e2eaa5..6a7a6c6d11 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -213,7 +213,7 @@ def __init__(
             and not inspect_data
         ):
             inspect_data = json.loads((config_dir / "inspect-data.json").read_text())
-            if not immutables:            
+            if not immutables:
                 immutable_filenames = [i["file"] for i in inspect_data.values()]
                 immutables = [
                     f for f in self.files if Path(f).name in immutable_filenames