diff --git a/pooch/downloaders.py b/pooch/downloaders.py
index e34a5890..32a2090b 100644
--- a/pooch/downloaders.py
+++ b/pooch/downloaders.py
@@ -1137,6 +1137,6 @@ def populate_registry(self, pooch):
         """
 
         for filedata in self.api_response.json()["data"]["latestVersion"]["files"]:
-            pooch.registry[
-                filedata["dataFile"]["filename"]
-            ] = f"md5:{filedata['dataFile']['md5']}"
+            pooch.registry[filedata["dataFile"]["filename"]] = (
+                f"md5:{filedata['dataFile']['md5']}"
+            )