diff --git a/src/test/regress/expected/alter_table.out b/src/test/regress/expected/alter_table.out
index cab49ec0a8f..ca13f0c13ac 100644
--- a/src/test/regress/expected/alter_table.out
+++ b/src/test/regress/expected/alter_table.out
@@ -2245,12 +2245,26 @@ alter table recur1 alter column f2 type recur2; -- fails
 ERROR:  composite type recur1 cannot be made a member of itself
 -- SET STORAGE may need to add a TOAST table
 create table test_storage (a text, c text storage plain);
+select reltoastrelid <> 0 as has_toast_table
+  from pg_class where oid = 'test_storage'::regclass;
+ has_toast_table 
+-----------------
+ t
+(1 row)
+
 alter table test_storage alter a set storage plain;
-alter table test_storage add b int default 0; -- rewrite table to remove its TOAST table
+-- rewrite table to remove its TOAST table; need a non-constant column default
+alter table test_storage add b int default random()::int;
+select reltoastrelid <> 0 as has_toast_table
+  from pg_class where oid = 'test_storage'::regclass;
+ has_toast_table 
+-----------------
+ f
+(1 row)
+
 alter table test_storage alter a set storage extended; -- re-add TOAST table
 select reltoastrelid <> 0 as has_toast_table
-from pg_class
-where oid = 'test_storage'::regclass;
+  from pg_class where oid = 'test_storage'::regclass;
  has_toast_table 
 -----------------
  t
@@ -2263,12 +2277,12 @@ ERROR:  column data type integer can only have storage PLAIN
 create index test_storage_idx on test_storage (b, a);
 alter table test_storage alter column a set storage external;
 \d+ test_storage
-                                Table "public.test_storage"
- Column |  Type   | Collation | Nullable | Default | Storage  | Stats target | Description 
---------+---------+-----------+----------+---------+----------+--------------+-------------
- a      | text    |           |          |         | external |              | 
- c      | text    |           |          |         | plain    |              | 
- b      | integer |           |          | 0       | plain    |              | 
+                                     Table "public.test_storage"
+ Column |  Type   | Collation | Nullable |      Default      | Storage  | Stats target | Description 
+--------+---------+-----------+----------+-------------------+----------+--------------+-------------
+ a      | text    |           |          |                   | external |              | 
+ c      | text    |           |          |                   | plain    |              | 
+ b      | integer |           |          | random()::integer | plain    |              | 
 Indexes:
     "test_storage_idx" btree (b, a)
 
diff --git a/src/test/regress/sql/alter_table.sql b/src/test/regress/sql/alter_table.sql
index 5a71961f02d..b85b6c73989 100644
--- a/src/test/regress/sql/alter_table.sql
+++ b/src/test/regress/sql/alter_table.sql
@@ -1528,13 +1528,16 @@ alter table recur1 alter column f2 type recur2; -- fails
 
 -- SET STORAGE may need to add a TOAST table
 create table test_storage (a text, c text storage plain);
-alter table test_storage alter a set storage plain;
-alter table test_storage add b int default 0; -- rewrite table to remove its TOAST table
-alter table test_storage alter a set storage extended; -- re-add TOAST table
-
 select reltoastrelid <> 0 as has_toast_table
-from pg_class
-where oid = 'test_storage'::regclass;
+  from pg_class where oid = 'test_storage'::regclass;
+alter table test_storage alter a set storage plain;
+-- rewrite table to remove its TOAST table; need a non-constant column default
+alter table test_storage add b int default random()::int;
+select reltoastrelid <> 0 as has_toast_table
+  from pg_class where oid = 'test_storage'::regclass;
+alter table test_storage alter a set storage extended; -- re-add TOAST table
+select reltoastrelid <> 0 as has_toast_table
+  from pg_class where oid = 'test_storage'::regclass;
 
 -- check STORAGE correctness
 create table test_storage_failed (a text, b int storage extended);