diff --git a/contrib/test_decoding/expected/toast.out b/contrib/test_decoding/expected/toast.out
index 389748ff8c..91a9a1e86d 100644
--- a/contrib/test_decoding/expected/toast.out
+++ b/contrib/test_decoding/expected/toast.out
@@ -305,7 +305,13 @@ ALTER TABLE toasted_several REPLICA IDENTITY FULL;
 ALTER TABLE toasted_several ALTER COLUMN toasted_key SET STORAGE EXTERNAL;
 ALTER TABLE toasted_several ALTER COLUMN toasted_col1 SET STORAGE EXTERNAL;
 ALTER TABLE toasted_several ALTER COLUMN toasted_col2 SET STORAGE EXTERNAL;
-INSERT INTO toasted_several(toasted_key) VALUES(repeat('9876543210', 2000));
+INSERT INTO toasted_several(toasted_key) VALUES(repeat('9876543210', 10000));
+SELECT pg_column_size(toasted_key) > 2^16 FROM toasted_several;
+ ?column? 
+----------
+ t
+(1 row)
+
 SELECT regexp_replace(data, '^(.{100}).*(.{100})$', '\1..\2') FROM pg_logical_slot_peek_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
                                                                                                regexp_replace                                                                                               
 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
diff --git a/contrib/test_decoding/sql/toast.sql b/contrib/test_decoding/sql/toast.sql
index dcb74e38c7..ef11d2bfff 100644
--- a/contrib/test_decoding/sql/toast.sql
+++ b/contrib/test_decoding/sql/toast.sql
@@ -279,7 +279,8 @@ ALTER TABLE toasted_several ALTER COLUMN toasted_key SET STORAGE EXTERNAL;
 ALTER TABLE toasted_several ALTER COLUMN toasted_col1 SET STORAGE EXTERNAL;
 ALTER TABLE toasted_several ALTER COLUMN toasted_col2 SET STORAGE EXTERNAL;
 
-INSERT INTO toasted_several(toasted_key) VALUES(repeat('9876543210', 2000));
+INSERT INTO toasted_several(toasted_key) VALUES(repeat('9876543210', 10000));
+SELECT pg_column_size(toasted_key) > 2^16 FROM toasted_several;
 
 SELECT regexp_replace(data, '^(.{100}).*(.{100})$', '\1..\2') FROM pg_logical_slot_peek_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');