diff --git a/pangeo_forge_recipes/transforms.py b/pangeo_forge_recipes/transforms.py
index 6831d3e6..ff4bb0b6 100644
--- a/pangeo_forge_recipes/transforms.py
+++ b/pangeo_forge_recipes/transforms.py
@@ -184,15 +184,19 @@ def transfer_file(self, index: int, url: str) -> Tuple[int, str]:
         while retries <= self.max_retries:
             try:
                 open_kwargs = self.open_kwargs or {}
-                self.transfer_target.cache_file(url, self.secrets, self.fsspec_sync_patch, **open_kwargs)
+                self.transfer_target.cache_file(
+                    url, self.secrets, self.fsspec_sync_patch, **open_kwargs
+                )
                 return (index, self.transfer_target._full_path(url))
             except Exception as e:
                 if retries == self.max_retries:
                     logger.error(f"Max retries reached for {url}: {e}")
                     raise e
                 else:
-                    backoff_time = self.initial_backoff * (self.backoff_factor ** retries)
-                    logger.warning(f"Error transferring file {url}: {e}. Retrying in {backoff_time} seconds...")
+                    backoff_time = self.initial_backoff * (self.backoff_factor**retries)
+                    logger.warning(
+                        f"Error transferring file {url}: {e}. Retrying in {backoff_time} seconds..."
+                    )
                     time.sleep(backoff_time)
                     retries += 1
 
@@ -255,7 +259,7 @@ def expand(self, pcoll):
                     fsspec_sync_patch=self.fsspec_sync_patch,
                     max_retries=self.max_retries,
                     initial_backoff=self.initial_backoff,
-                    backoff_factor=self.backoff_factor
+                    backoff_factor=self.backoff_factor,
                 )
             )
         )