diff --git a/backup_permissions.install b/backup_permissions.install
index 1a8e4bb..2a6a2df 100644
--- a/backup_permissions.install
+++ b/backup_permissions.install
@@ -33,6 +33,7 @@ function backup_permissions_schema() {
       ),
       'backup' => array(
         'type' => 'text',
+        'size' => 'big',
         'not null' => TRUE,
         'description' => "Serialized array of role id's",
       ),