diff --git a/arraycontext/impl/pytato/compile.py b/arraycontext/impl/pytato/compile.py
index a4f80fb4..0b2cd715 100644
--- a/arraycontext/impl/pytato/compile.py
+++ b/arraycontext/impl/pytato/compile.py
@@ -287,8 +287,9 @@ def _dag_to_compiled_func(self, ary_or_dict_of_named_arrays,
             output_template):
         if isinstance(ary_or_dict_of_named_arrays, pt.Array):
             output_id = "_pt_out"
-            dict_of_named_arrays = pt.make_dict_of_named_arrays(
-                {output_id: ary_or_dict_of_named_arrays})
+            dict_of_named_arrays = pt.transform.deduplicate(
+                pt.make_dict_of_named_arrays(
+                    {output_id: ary_or_dict_of_named_arrays}))
             pytato_program, name_in_program_to_tags, name_in_program_to_axes = (
                 self._dag_to_transformed_pytato_prg(dict_of_named_arrays,
                     prg_id=self.f))
@@ -299,6 +300,8 @@ def _dag_to_compiled_func(self, ary_or_dict_of_named_arrays,
                 output_axes=name_in_program_to_axes[output_id],
                 output_name=output_id)
         elif isinstance(ary_or_dict_of_named_arrays, pt.DictOfNamedArrays):
+            ary_or_dict_of_named_arrays = pt.transform.deduplicate(
+                ary_or_dict_of_named_arrays)
             pytato_program, name_in_program_to_tags, name_in_program_to_axes = (
                 self._dag_to_transformed_pytato_prg(ary_or_dict_of_named_arrays,
                     prg_id=self.f))