diff --git a/github/WorkflowRun.py b/github/WorkflowRun.py
index ac66f97391..1e8e00e4de 100644
--- a/github/WorkflowRun.py
+++ b/github/WorkflowRun.py
@@ -319,8 +319,12 @@ def _useAttributes(self, attributes):
         if "event" in attributes:  # pragma no branch
             self._event = self._makeStringAttribute(attributes["event"])
         if "run_started_at" in attributes:  # pragma no branch
-            assert attributes["run_started_at"] is None or isinstance(attributes["run_started_at"], str), attributes["run_started_at"]
-            self._run_started_at = self._makeDatetimeAttribute(attributes["run_started_at"])
+            assert attributes["run_started_at"] is None or isinstance(
+                attributes["run_started_at"], str
+            ), attributes["run_started_at"]
+            self._run_started_at = self._makeDatetimeAttribute(
+                attributes["run_started_at"]
+            )
         if "status" in attributes:  # pragma no branch
             self._status = self._makeStringAttribute(attributes["status"])
         if "conclusion" in attributes:  # pragma no branch