diff --git a/delegator/delegator.install b/delegator/delegator.install
index cb578ba96c598176321fb34644f095c053e0be8d..627d6123af553a8944a6a734790cec9d79635b02 100644
--- a/delegator/delegator.install
+++ b/delegator/delegator.install
@@ -79,6 +79,8 @@ function delegator_schema_1() {
         'type' => 'varchar',
         'length' => '255',
         'description' => t('Unique ID for this task handler. Used to identify it programmatically.'),
+        'not null' => TRUE,
+        'default' => '',
       ),
       'weight' => array(
         'type' => 'int',