diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index ae6c5383ee..ea9c7b67c2 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -690,7 +690,6 @@ phutil_register_library_map(array(
     'LiskMigrationIterator' => 'infrastructure/storage/lisk/LiskMigrationIterator.php',
     'LiskRawMigrationIterator' => 'infrastructure/storage/lisk/LiskRawMigrationIterator.php',
     'ManiphestAction' => 'applications/maniphest/constants/ManiphestAction.php',
-    'ManiphestAuxiliaryFieldSpecification' => 'applications/maniphest/auxiliaryfield/ManiphestAuxiliaryFieldSpecification.php',
     'ManiphestBatchEditController' => 'applications/maniphest/controller/ManiphestBatchEditController.php',
     'ManiphestConfiguredCustomField' => 'applications/maniphest/field/ManiphestConfiguredCustomField.php',
     'ManiphestConstants' => 'applications/maniphest/constants/ManiphestConstants.php',
diff --git a/src/applications/maniphest/auxiliaryfield/ManiphestAuxiliaryFieldSpecification.php b/src/applications/maniphest/auxiliaryfield/ManiphestAuxiliaryFieldSpecification.php
deleted file mode 100644
index 60df075771..0000000000
--- a/src/applications/maniphest/auxiliaryfield/ManiphestAuxiliaryFieldSpecification.php
+++ /dev/null
@@ -1,56 +0,0 @@
-<?php
-
-/**
- * TODO: Destroy after ApplicationTransactions.
- */
-final class ManiphestAuxiliaryFieldSpecification {
-
-  public static function writeLegacyAuxiliaryUpdates(
-    ManiphestTask $task,
-    array $map) {
-
-    $table = new ManiphestCustomFieldStorage();
-    $conn_w = $table->establishConnection('w');
-    $update = array();
-    $remove = array();
-
-    foreach ($map as $key => $value) {
-      $index = PhabricatorHash::digestForIndex($key);
-      if ($value === null) {
-        $remove[$index] = true;
-      } else {
-        $update[$index] = $value;
-      }
-    }
-
-    if ($remove) {
-      queryfx(
-        $conn_w,
-        'DELETE FROM %T WHERE objectPHID = %s AND fieldIndex IN (%Ls)',
-        $table->getTableName(),
-        $task->getPHID(),
-        array_keys($remove));
-    }
-
-    if ($update) {
-      $sql = array();
-      foreach ($update as $index => $val) {
-        $sql[] = qsprintf(
-          $conn_w,
-          '(%s, %s, %s)',
-          $task->getPHID(),
-          $index,
-          $val);
-      }
-      queryfx(
-        $conn_w,
-        'INSERT INTO %T (objectPHID, fieldIndex, fieldValue)
-          VALUES %Q ON DUPLICATE KEY
-          UPDATE fieldValue = VALUES(fieldValue)',
-        $table->getTableName(),
-        implode(', ', $sql));
-    }
-
-  }
-
-}