diff --git a/src/applications/differential/view/revisionupdatehistory/DifferentialRevisionUpdateHistoryView.php b/src/applications/differential/view/revisionupdatehistory/DifferentialRevisionUpdateHistoryView.php
index bdc64a6bd5..385ae8ce32 100644
--- a/src/applications/differential/view/revisionupdatehistory/DifferentialRevisionUpdateHistoryView.php
+++ b/src/applications/differential/view/revisionupdatehistory/DifferentialRevisionUpdateHistoryView.php
@@ -191,9 +191,10 @@ final class DifferentialRevisionUpdateHistoryView extends AphrontView {
       ));
 
     $options = array(
-      'ignore-all' => 'Ignore Most',
-      'ignore-trailing' => 'Ignore Trailing',
-      'show-all' => 'Show All',
+      DifferentialChangesetParser::WHITESPACE_IGNORE_ALL => 'Ignore Most',
+      DifferentialChangesetParser::WHITESPACE_IGNORE_TRAILING =>
+        'Ignore Trailing',
+      DifferentialChangesetParser::WHITESPACE_SHOW_ALL => 'Show All',
     );
 
     $select = '<select name="whitespace">';
diff --git a/src/applications/differential/view/revisionupdatehistory/__init__.php b/src/applications/differential/view/revisionupdatehistory/__init__.php
index ee163ad5cf..a47e669d47 100644
--- a/src/applications/differential/view/revisionupdatehistory/__init__.php
+++ b/src/applications/differential/view/revisionupdatehistory/__init__.php
@@ -8,6 +8,7 @@
 
 phutil_require_module('phabricator', 'applications/differential/constants/lintstatus');
 phutil_require_module('phabricator', 'applications/differential/constants/unitstatus');
+phutil_require_module('phabricator', 'applications/differential/parser/changeset');
 phutil_require_module('phabricator', 'infrastructure/celerity/api');
 phutil_require_module('phabricator', 'infrastructure/javelin/api');
 phutil_require_module('phabricator', 'infrastructure/javelin/markup');