diff --git a/barterdude/__init__.py b/barterdude/__init__.py
index a3fbf68..dd318f3 100644
--- a/barterdude/__init__.py
+++ b/barterdude/__init__.py
@@ -45,7 +45,11 @@ def add_callback_endpoint(
         mock_dependencies: Iterable[Tuple[Any, str]] = None,
     ):
         async def hook_to_callback(req: web.Request):
-            return await self._call_callback_endpoint(req, hook, mock_dependencies)
+            return await self._call_callback_endpoint(
+                req,
+                hook,
+                mock_dependencies
+            )
 
         self.add_endpoint(
             routes=routes,