diff --git a/src/lint/engine/ArcanistLintEngine.php b/src/lint/engine/ArcanistLintEngine.php
--- a/src/lint/engine/ArcanistLintEngine.php
+++ b/src/lint/engine/ArcanistLintEngine.php
@@ -56,7 +56,6 @@
 
   private $changedLines = array();
 
-  private $enableAsyncLint = false;
   private $configurationManager;
 
   private $linterResources = array();
@@ -110,15 +109,6 @@
     return $this;
   }
 
-  final public function setEnableAsyncLint($enable_async_lint) {
-    $this->enableAsyncLint = $enable_async_lint;
-    return $this;
-  }
-
-  final public function getEnableAsyncLint() {
-    return $this->enableAsyncLint;
-  }
-
   final public function loadData($path) {
     if (!isset($this->fileData[$path])) {
       $disk_path = $this->getFilePathOnDisk($path);
diff --git a/src/workflow/ArcanistLintWorkflow.php b/src/workflow/ArcanistLintWorkflow.php
--- a/src/workflow/ArcanistLintWorkflow.php
+++ b/src/workflow/ArcanistLintWorkflow.php
@@ -286,13 +286,6 @@
       }
     }
 
-    // Enable possible async linting only for 'arc diff' not 'arc lint'
-    if ($this->getParentWorkflow()) {
-      $engine->setEnableAsyncLint(true);
-    } else {
-      $engine->setEnableAsyncLint(false);
-    }
-
     if ($this->getArgument('only-new')) {
       $conduit = $this->getConduit();
       $api = $this->getRepositoryAPI();