diff --git a/src/unit/ArcanistUnitTestResult.php b/src/unit/ArcanistUnitTestResult.php
index ec25c20f..9a5f6d78 100644
--- a/src/unit/ArcanistUnitTestResult.php
+++ b/src/unit/ArcanistUnitTestResult.php
@@ -174,6 +174,13 @@ final class ArcanistUnitTestResult extends Phobject {
     );
   }
 
+  public function getSortVector() {
+    return (new PhutilSortVector())
+      ->addInt($this->getResult() === self::RESULT_PASS ? 0 : 1)
+      ->addString($this->getResult())
+      ->addInt($this->getDuration() * 1000);
+  }
+
   public static function getAllResultCodes() {
     return array(
       self::RESULT_PASS,
diff --git a/src/workflow/ArcanistUnitWorkflow.php b/src/workflow/ArcanistUnitWorkflow.php
index 00ef8a59..f8eb7488 100644
--- a/src/workflow/ArcanistUnitWorkflow.php
+++ b/src/workflow/ArcanistUnitWorkflow.php
@@ -165,6 +165,7 @@ EOTEXT
     $this->engine->setEnableCoverage($enable_coverage);
 
     $results = $this->engine->run();
+    $results = msortv($results, 'getSortVector');
 
     $this->validateUnitEngineResults($this->engine, $results);