diff --git a/cas_server.install b/cas_server.install
index 97695617527fb6fc08f37af6486724d44feb84a7..2dca01bb74576679ab17d70b79473f4abe74dfc0 100644
--- a/cas_server.install
+++ b/cas_server.install
@@ -22,6 +22,7 @@ function cas_server_schema() {
       ],
       'expiration' => [
         'description' => 'Time after which the ticket is invalid.',
+        'type' => 'int',
         'mysql_type' => 'datetime',
         'pgsql_type' => 'timestamp',
         'not null' => TRUE,