diff --git a/red_githubbot/routers/backport_pr.py b/red_githubbot/routers/backport_pr.py
index 0f28cf2..40d4d90 100644
--- a/red_githubbot/routers/backport_pr.py
+++ b/red_githubbot/routers/backport_pr.py
@@ -83,7 +83,9 @@ async def backport_pr(event: sansio.Event) -> None:
             status=utils.CheckRunStatus.IN_PROGRESS,
         )
 
-        sorted_branches = sorted(branches, key=cherry_picker.version_sort_key)
+        sorted_branches = sorted(
+            branches, key=functools.partial(cherry_picker.version_sort_key, CHERRY_PICKER_CONFIG)
+        )
 
         for branch in sorted_branches:
             try: