diff --git a/.flake8 b/.flake8
index 0a219a4bb..e6dbe70f2 100644
--- a/.flake8
+++ b/.flake8
@@ -26,6 +26,9 @@ per-file-ignores =
     tests/e2e/test_workflows.py: IMR241,
     tests/test_subcmds_sync.py: IMR241,
 extend-ignore =
+    # B042: Exception class with __init__ should pass all args to super().__init__()
+    # We should fix this by reworking our exception classes.
+    B042,
     # E203: Whitespace before ':'
     # See https://github.com/PyCQA/pycodestyle/issues/373
     E203,
diff --git a/subcmds/sync.py b/subcmds/sync.py
index 7d3e2f925..4b13d6d96 100644
--- a/subcmds/sync.py
+++ b/subcmds/sync.py
@@ -1199,7 +1199,7 @@ later is required to fix a server side protocol bug.
         # job at the same time. Then the connection may fail if too many
         # connections are pending and execeeded the socket listening backlog,
         # especially on MacOS.
-        len(cls.get_parallel_context()["sync_dict"])
+        _ = len(cls.get_parallel_context()["sync_dict"])
 
     def _Fetch(self, projects, opt, err_event, ssh_proxy, errors):
         ret = True