diff --git a/lib/Doctrine/DataDict/Pgsql.php b/lib/Doctrine/DataDict/Pgsql.php
index 8776db7a0..49624d308 100644
--- a/lib/Doctrine/DataDict/Pgsql.php
+++ b/lib/Doctrine/DataDict/Pgsql.php
@@ -486,6 +486,7 @@ class Doctrine_DataDict_Pgsql extends Doctrine_DataDict
                 break;
             case 'text':
             case 'varchar':
+            case 'interval':
                 $fixed = false;
             case 'unknown':
             case 'char':