diff --git a/torchx/test/fixtures.py b/torchx/test/fixtures.py
index 3cc669034..eab62a52e 100644
--- a/torchx/test/fixtures.py
+++ b/torchx/test/fixtures.py
@@ -182,6 +182,7 @@ def run_ddp(
 
         See class docstring for usage example.
         """
+        # pyre-fixme[28]: Unexpected keyword argument `log_dir`.
         config = LaunchConfig(
             min_nodes=1,
             max_nodes=1,