diff --git a/test/sampletables.sql b/test/sampletables.sql
index 9eddeffc..94ae96b8 100644
--- a/test/sampletables.sql
+++ b/test/sampletables.sql
@@ -32,7 +32,8 @@ INSERT INTO booltab VALUES (3, 'true', true);
 INSERT INTO booltab VALUES (4, 'false', false);
 INSERT INTO booltab VALUES (5, 'not', false);
 
-CREATE TABLE test_special( id integer primary key, ival integer);
+CREATE TABLE test_special( id integer, ival integer);
+CREATE UNIQUE index test_special_id on public.test_special(id);
 CREATE UNIQUE index test_special_ui on public.test_special(ival);
 
 -- View