diff --git a/src/bomf/filter/sourcedataproviderfilter.py b/src/bomf/filter/sourcedataproviderfilter.py
index a96c0f3..cc34db8 100644
--- a/src/bomf/filter/sourcedataproviderfilter.py
+++ b/src/bomf/filter/sourcedataproviderfilter.py
@@ -22,7 +22,9 @@ def __init__(self, candidate_filter: Filter[Candidate]):
         self._filter = candidate_filter
 
     @overload
-    async def apply(self, source_data_provider: JsonFileSourceDataProvider) -> SourceDataProvider[Candidate, KeyTyp]:
+    async def apply(
+        self, source_data_provider: JsonFileSourceDataProvider[Candidate, KeyTyp]
+    ) -> SourceDataProvider[Candidate, KeyTyp]:
         ...
 
     @overload