diff --git a/src/applications/search/storage/document/PhabricatorSearchDocumentField.php b/src/applications/search/storage/document/PhabricatorSearchDocumentField.php
--- a/src/applications/search/storage/document/PhabricatorSearchDocumentField.php
+++ b/src/applications/search/storage/document/PhabricatorSearchDocumentField.php
@@ -15,7 +15,7 @@
         'phidType' => 'text4',
         'field' => 'text4',
         'auxPHID' => 'phid?',
-        'corpus' => 'text?',
+        'corpus' => 'sort?',
       ),
       self::CONFIG_KEY_SCHEMA => array(
         'key_phid' => null,