diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index 4730770067..4492d4eb55 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1024,7 +1024,6 @@ phutil_register_library_map(array(
     'ManiphestTask' => 'applications/maniphest/storage/ManiphestTask.php',
     'ManiphestTaskDependedOnByTaskEdgeType' => 'applications/maniphest/edge/ManiphestTaskDependedOnByTaskEdgeType.php',
     'ManiphestTaskDependsOnTaskEdgeType' => 'applications/maniphest/edge/ManiphestTaskDependsOnTaskEdgeType.php',
-    'ManiphestTaskDescriptionPreviewController' => 'applications/maniphest/controller/ManiphestTaskDescriptionPreviewController.php',
     'ManiphestTaskDetailController' => 'applications/maniphest/controller/ManiphestTaskDetailController.php',
     'ManiphestTaskEditController' => 'applications/maniphest/controller/ManiphestTaskEditController.php',
     'ManiphestTaskHasCommitEdgeType' => 'applications/maniphest/edge/ManiphestTaskHasCommitEdgeType.php',
@@ -4165,7 +4164,6 @@ phutil_register_library_map(array(
     ),
     'ManiphestTaskDependedOnByTaskEdgeType' => 'PhabricatorEdgeType',
     'ManiphestTaskDependsOnTaskEdgeType' => 'PhabricatorEdgeType',
-    'ManiphestTaskDescriptionPreviewController' => 'ManiphestController',
     'ManiphestTaskDetailController' => 'ManiphestController',
     'ManiphestTaskEditController' => 'ManiphestController',
     'ManiphestTaskHasCommitEdgeType' => 'PhabricatorEdgeType',
diff --git a/src/applications/maniphest/controller/ManiphestTaskDescriptionPreviewController.php b/src/applications/maniphest/controller/ManiphestTaskDescriptionPreviewController.php
deleted file mode 100644
index a1a484727a..0000000000
--- a/src/applications/maniphest/controller/ManiphestTaskDescriptionPreviewController.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-
-final class ManiphestTaskDescriptionPreviewController
-  extends ManiphestController {
-
-  public function processRequest() {
-    $request = $this->getRequest();
-    $description = $request->getStr('description');
-
-    $task = new ManiphestTask();
-    $task->setDescription($description);
-
-    $output = PhabricatorMarkupEngine::renderOneObject(
-      $task,
-      ManiphestTask::MARKUP_FIELD_DESCRIPTION,
-      $request->getUser(),
-      $task);
-
-    $content = phutil_tag_div('phabricator-remarkup', $output);
-
-    return id(new AphrontAjaxResponse())
-      ->setContent($content);
-  }
-
-}