diff --git a/grudge/execution.py b/grudge/execution.py
index ace2dc8bd1403035e217b5936cf3eca302f358c6..ff14c6f3bddd2555c3ab22dafb694845b38d7d6a 100644
--- a/grudge/execution.py
+++ b/grudge/execution.py
@@ -279,6 +279,10 @@ class ExecutionMapper(mappers.Evaluator,
 
         return conn(self.queue, self.rec(field_expr)).with_queue(self.queue)
 
+    def map_opposite_partition_face_swap(self, op, field_expr):
+        raise NotImplementedError("map_opposite_partition_face_swap")
+        return None
+
     def map_opposite_interior_face_swap(self, op, field_expr):
         dd = op.dd_in