diff --git a/lib/pg_repack.sql.in b/lib/pg_repack.sql.in
index 33c9868..862ed84 100644
--- a/lib/pg_repack.sql.in
+++ b/lib/pg_repack.sql.in
@@ -184,6 +184,8 @@ FROM (
     WHERE oid = $1
 
     ) as t
+$$
+LANGUAGE sql STABLE STRICT;
 
 -- GET a SQL text to set column storage option for the table.
 CREATE FUNCTION repack.get_alter_col_storage(oid)
diff --git a/regress/expected/repack.out b/regress/expected/repack.out
index ebecc9a..dd4541d 100644
--- a/regress/expected/repack.out
+++ b/regress/expected/repack.out
@@ -314,6 +314,7 @@ ORDER BY 1;
  tbl_with_toast | {autovacuum_vacuum_scale_factor=30,autovacuum_vacuum_threshold=300}
  toast_table    | {autovacuum_vacuum_scale_factor=40,autovacuum_vacuum_threshold=400}
 (2 rows)
+
 SELECT pg_relation_size(reltoastrelid) = 0 as check_toast_rel_size FROM pg_class WHERE relname = 'tbl_with_mod_column_storage';
  check_toast_rel_size 
 ----------------------
diff --git a/regress/expected/repack_1.out b/regress/expected/repack_1.out
index 3c2f62e..a7bbe2f 100644
--- a/regress/expected/repack_1.out
+++ b/regress/expected/repack_1.out
@@ -314,6 +314,7 @@ ORDER BY 1;
  tbl_with_toast | {autovacuum_vacuum_scale_factor=30,autovacuum_vacuum_threshold=300}
  toast_table    | {autovacuum_vacuum_scale_factor=40,autovacuum_vacuum_threshold=400}
 (2 rows)
+
 SELECT pg_relation_size(reltoastrelid) = 0 as check_toast_rel_size FROM pg_class WHERE relname = 'tbl_with_mod_column_storage';
  check_toast_rel_size 
 ----------------------