diff --git a/src/applications/feed/query/PhabricatorFeedQuery.php b/src/applications/feed/query/PhabricatorFeedQuery.php
--- a/src/applications/feed/query/PhabricatorFeedQuery.php
+++ b/src/applications/feed/query/PhabricatorFeedQuery.php
@@ -101,7 +101,7 @@
       'key' => array(
         'table' => $table,
         'column' => 'chronologicalKey',
-        'type' => 'int',
+        'type' => 'string',
         'unique' => true,
       ),
     );