diff --git a/sql/sql/setup_02_create_table.sql b/sql/sql/setup_02_create_table.sql
index 134f9ac..ffd9f37 100644
--- a/sql/sql/setup_02_create_table.sql
+++ b/sql/sql/setup_02_create_table.sql
@@ -78,7 +78,7 @@ if not exists (select * from sysobjects where name='persons')
     lastname varchar(50) not null,
     date_of_birth date not null,
     streetname varchar(50) not null,
-    streetnumber int,
+    streetnumber varchar(4) not null,
     city_id int not null,
     country_id int not null,
     constraint person_pk primary key (person_id),