diff --git a/src/test/regress/expected/polymorphism.out b/src/test/regress/expected/polymorphism.out
index 2c3bb0a60b..628a39612a 100644
--- a/src/test/regress/expected/polymorphism.out
+++ b/src/test/regress/expected/polymorphism.out
@@ -786,16 +786,18 @@ create aggregate build_group(int8, integer) (
   STYPE = int8[]
 );
 -- check proper resolution of data types for polymorphic transfn/finalfn
-create function first_el(anycompatiblearray) returns anycompatible as
+create function first_el_transfn(anyarray, anyelement) returns anyarray as
+'select $1 || $2' language sql immutable;
+create function first_el(anyarray) returns anyelement as
 'select $1[1]' language sql strict immutable;
 create aggregate first_el_agg_f8(float8) (
   SFUNC = array_append,
   STYPE = float8[],
   FINALFUNC = first_el
 );
-create aggregate first_el_agg_any(anycompatible) (
-  SFUNC = array_append,
-  STYPE = anycompatiblearray,
+create aggregate first_el_agg_any(anyelement) (
+  SFUNC = first_el_transfn,
+  STYPE = anyarray,
   FINALFUNC = first_el
 );
 select first_el_agg_f8(x::float8) from generate_series(1,10) x;
diff --git a/src/test/regress/sql/polymorphism.sql b/src/test/regress/sql/polymorphism.sql
index 70a21c8978..d98a74c3f6 100644
--- a/src/test/regress/sql/polymorphism.sql
+++ b/src/test/regress/sql/polymorphism.sql
@@ -549,7 +549,10 @@ create aggregate build_group(int8, integer) (
 
 -- check proper resolution of data types for polymorphic transfn/finalfn
 
-create function first_el(anycompatiblearray) returns anycompatible as
+create function first_el_transfn(anyarray, anyelement) returns anyarray as
+'select $1 || $2' language sql immutable;
+
+create function first_el(anyarray) returns anyelement as
 'select $1[1]' language sql strict immutable;
 
 create aggregate first_el_agg_f8(float8) (
@@ -558,9 +561,9 @@ create aggregate first_el_agg_f8(float8) (
   FINALFUNC = first_el
 );
 
-create aggregate first_el_agg_any(anycompatible) (
-  SFUNC = array_append,
-  STYPE = anycompatiblearray,
+create aggregate first_el_agg_any(anyelement) (
+  SFUNC = first_el_transfn,
+  STYPE = anyarray,
   FINALFUNC = first_el
 );