diff --git a/cas.install b/cas.install
index 45ea0ef..9da4190 100644
--- a/cas.install
+++ b/cas.install
@@ -44,13 +44,13 @@ function cas_schema() {
       'pgt_iou' => array(
         'description' => 'PGTIOU is the key returned from the CAS server for the PGT',
         'type' => 'varchar',
-        'length' => 255,
+        'length' => 127,
         'not null' => TRUE,
       ),
       'pgt' => array(
         'description' => 'The actual ProxyGrantingTicket value.',
         'type' => 'varchar',
-        'length' => 255,
+        'length' => 127,
         'not null' => TRUE,
       ),
       'timestamp' => array(