diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index 919a7733ad..390c544347 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -461,7 +461,6 @@ phutil_register_library_map(array(
     'DifferentialUpdateRevisionConduitAPIMethod' => 'applications/differential/conduit/DifferentialUpdateRevisionConduitAPIMethod.php',
     'DifferentialUpdateUnitResultsConduitAPIMethod' => 'applications/differential/conduit/DifferentialUpdateUnitResultsConduitAPIMethod.php',
     'DifferentialViewPolicyField' => 'applications/differential/customfield/DifferentialViewPolicyField.php',
-    'DiffusionArcanistProjectDatasource' => 'applications/diffusion/typeahead/DiffusionArcanistProjectDatasource.php',
     'DiffusionAuditorDatasource' => 'applications/diffusion/typeahead/DiffusionAuditorDatasource.php',
     'DiffusionBranchQueryConduitAPIMethod' => 'applications/diffusion/conduit/DiffusionBranchQueryConduitAPIMethod.php',
     'DiffusionBranchTableController' => 'applications/diffusion/controller/DiffusionBranchTableController.php',
@@ -3710,7 +3709,6 @@ phutil_register_library_map(array(
     'DifferentialUpdateRevisionConduitAPIMethod' => 'DifferentialConduitAPIMethod',
     'DifferentialUpdateUnitResultsConduitAPIMethod' => 'DifferentialConduitAPIMethod',
     'DifferentialViewPolicyField' => 'DifferentialCoreCustomField',
-    'DiffusionArcanistProjectDatasource' => 'PhabricatorTypeaheadDatasource',
     'DiffusionAuditorDatasource' => 'PhabricatorTypeaheadCompositeDatasource',
     'DiffusionBranchQueryConduitAPIMethod' => 'DiffusionQueryConduitAPIMethod',
     'DiffusionBranchTableController' => 'DiffusionController',
diff --git a/src/applications/diffusion/typeahead/DiffusionArcanistProjectDatasource.php b/src/applications/diffusion/typeahead/DiffusionArcanistProjectDatasource.php
deleted file mode 100644
index 4f58acfa59..0000000000
--- a/src/applications/diffusion/typeahead/DiffusionArcanistProjectDatasource.php
+++ /dev/null
@@ -1,39 +0,0 @@
-<?php
-
-final class DiffusionArcanistProjectDatasource
-  extends PhabricatorTypeaheadDatasource {
-
-  public function isBrowsable() {
-    // TODO: We should probably make this browsable, or maybe remove it.
-    return false;
-  }
-
-  public function getBrowseTitle() {
-    return pht('Browse Arcanist Projects');
-  }
-
-  public function getPlaceholderText() {
-    return pht('Type an arcanist project name...');
-  }
-
-  public function getDatasourceApplicationClass() {
-    return 'PhabricatorDiffusionApplication';
-  }
-
-  public function loadResults() {
-    $viewer = $this->getViewer();
-    $raw_query = $this->getRawQuery();
-
-    $results = array();
-
-    $arcprojs = id(new PhabricatorRepositoryArcanistProject())->loadAll();
-    foreach ($arcprojs as $proj) {
-      $results[] = id(new PhabricatorTypeaheadResult())
-        ->setName($proj->getName())
-        ->setPHID($proj->getPHID());
-    }
-
-    return $results;
-  }
-
-}