diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index e44ad68cda..eaec697bb3 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -4138,8 +4138,12 @@ ExecEvalWholeRowVar(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
 			 * generates an INT4 NULL regardless of the dropped column type).
 			 * If we find a dropped column and cannot verify that case (1)
 			 * holds, we have to use the slow path to check (2) for each row.
+			 *
+			 * If vartype is a domain over composite, just look through that
+			 * to the base composite type.
 			 */
-			var_tupdesc = lookup_rowtype_tupdesc(variable->vartype, -1);
+			var_tupdesc = lookup_rowtype_tupdesc_domain(variable->vartype,
+														-1, false);
 
 			slot_tupdesc = slot->tts_tupleDescriptor;
 
diff --git a/src/test/regress/expected/domain.out b/src/test/regress/expected/domain.out
index 8faf46d404..73b010f6ed 100644
--- a/src/test/regress/expected/domain.out
+++ b/src/test/regress/expected/domain.out
@@ -277,6 +277,29 @@ Rules:
     ON DELETE TO dcomptable DO INSTEAD  UPDATE dcomptable SET d1.r = (dcomptable.d1).r - 1::double precision, d1.i = (dcomptable.d1).i + 1::double precision
   WHERE (dcomptable.d1).i > 0::double precision
 
+create function makedcomp(r float8, i float8) returns dcomptype
+as 'select row(r, i)' language sql;
+select makedcomp(1,2);
+ makedcomp 
+-----------
+ (1,2)
+(1 row)
+
+select makedcomp(2,1);  -- fail
+ERROR:  value for domain dcomptype violates check constraint "c1"
+select * from makedcomp(1,2) m;
+ r | i 
+---+---
+ 1 | 2
+(1 row)
+
+select m, m is not null from makedcomp(1,2) m;
+   m   | ?column? 
+-------+----------
+ (1,2) | t
+(1 row)
+
+drop function makedcomp(float8, float8);
 drop table dcomptable;
 drop type comptype cascade;
 NOTICE:  drop cascades to type dcomptype
diff --git a/src/test/regress/sql/domain.sql b/src/test/regress/sql/domain.sql
index bf48c53e9c..f2ca1fb675 100644
--- a/src/test/regress/sql/domain.sql
+++ b/src/test/regress/sql/domain.sql
@@ -154,6 +154,15 @@ create rule silly as on delete to dcomptable do instead
   update dcomptable set d1.r = (d1).r - 1, d1.i = (d1).i + 1 where (d1).i > 0;
 \d+ dcomptable
 
+create function makedcomp(r float8, i float8) returns dcomptype
+as 'select row(r, i)' language sql;
+
+select makedcomp(1,2);
+select makedcomp(2,1);  -- fail
+select * from makedcomp(1,2) m;
+select m, m is not null from makedcomp(1,2) m;
+
+drop function makedcomp(float8, float8);
 drop table dcomptable;
 drop type comptype cascade;