diff --git a/grudge/trace_pair.py b/grudge/trace_pair.py
index 6fef5ab10..2e6742e2d 100644
--- a/grudge/trace_pair.py
+++ b/grudge/trace_pair.py
@@ -431,7 +431,7 @@ def get_opposite_trace(ary):
                 if isinstance(ary, Number):
                     return ary
                 else:
-                    return other_to_self(ary)
+                    return other_to_self(ary)  # noqa: B023
 
             from arraycontext import rec_map_array_container
             from meshmode.dof_array import DOFArray