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 +9,26 @@
   private $committerEmail;
   private $hashes = array();
 
+  public static function newFromConduitResult(array $result) {
+    $ref = id(new DiffusionCommitRef())
+      ->setCommitterEmail(idx($result, 'committerEmail'))
+      ->setCommitterName(idx($result, 'committerName'))
+      ->setAuthorEmail(idx($result, 'authorEmail'))
+      ->setAuthorName(idx($result, 'authorName'))
+      ->setMessage(idx($result, 'message'));
+
+    $hashes = array();
+    foreach (idx($result, 'hashes', array()) as $hash_result) {
+      $hashes[] = id(new DiffusionCommitHash())
+        ->setHashType(idx($hash_result, 'type'))
+        ->setHashValue(idx($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 +33,25 @@
         "%s\n",
         pht('Examining commit %s...', $name));
 
-      $ref = id(new DiffusionLowLevelCommitQuery())
-        ->setRepository($repo)
-        ->withIdentifier($commit->getCommitIdentifier())
-        ->execute();
+      $refs_raw = DiffusionQuery::callConduitWithDiffusionRequest(
+        $this->getViewer(),
+        DiffusionRequest::newFromDictionary(
+          array(
+            'repository' => $repo,
+            'user' => $this->getViewer(),
+          )),
+        'diffusion.querycommits',
+        array(
+          'phids' => array($commit->getPHID()),
+          'bypassCache' => true,
+        ));
+
+      if (empty($refs_raw['data'])) {
+        throw new Exception(
+          pht('Unable to retrieve details for commit "%s"!'));
+      }
+
+      $ref = DiffusionCommitRef::newFromConduitResult(head($refs_raw['data']));
 
       $author = $ref->getAuthor();
       $console->writeOut(