diff --git a/src/applications/diffusion/data/DiffusionCommitRef.php b/src/applications/diffusion/data/DiffusionCommitRef.php
--- a/src/applications/diffusion/data/DiffusionCommitRef.php
+++ b/src/applications/diffusion/data/DiffusionCommitRef.php
@@ -9,6 +9,25 @@
   private $committerEmail;
   private $hashes = array();
 
+  public static function fromConduitResult($result) {
+    $ref = id(new DiffusionCommitRef())
+      ->setCommitterEmail($result['committerEmail'])
+      ->setCommitterName($result['committerName'])
+      ->setAuthorEmail($result['authorEmail'])
+      ->setAuthorName($result['authorName'])
+      ->setMessage($result['message']);
+
+    $hashes = array();
+    foreach ($result['hashes'] as $hash_result) {
+      $hashes[] = id(new DiffusionCommitHash())
+        ->setHashType($hash_result['type'])
+        ->setHashValue($hash_result['value']);
+    }
+
+    $ref->setHashes($hashes);
+    return $ref;
+  }
+
   public function setHashes(array $hashes) {
     $this->hashes = $hashes;
     return $this;
diff --git a/src/applications/repository/management/PhabricatorRepositoryManagementLookupUsersWorkflow.php b/src/applications/repository/management/PhabricatorRepositoryManagementLookupUsersWorkflow.php
--- a/src/applications/repository/management/PhabricatorRepositoryManagementLookupUsersWorkflow.php
+++ b/src/applications/repository/management/PhabricatorRepositoryManagementLookupUsersWorkflow.php
@@ -33,10 +33,17 @@
         "%s\n",
         pht('Examining commit %s...', $name));
 
-      $ref = id(new DiffusionLowLevelCommitQuery())
-        ->setRepository($repo)
-        ->withIdentifier($commit->getCommitIdentifier())
-        ->execute();
+      $conduit_call = id(new ConduitCall(
+        'diffusion.querycommits',
+        array(
+          'repositoryPHID' => $repo->getPHID(),
+          'phids' => array($commit->getPHID()),
+          'bypassCache' => true,
+        )));
+      $conduit_call->setUser(PhabricatorUser::getOmnipotentUser());
+      $refs_raw = $conduit_call->execute();
+
+      $ref = DiffusionCommitRef::fromConduitResult(head($refs_raw['data']));
 
       $author = $ref->getAuthor();
       $console->writeOut(