diff --git a/src/lint/linter/ArcanistExternalLinter.php b/src/lint/linter/ArcanistExternalLinter.php
--- a/src/lint/linter/ArcanistExternalLinter.php
+++ b/src/lint/linter/ArcanistExternalLinter.php
@@ -192,7 +192,7 @@
    * @task bin
    */
   public function getDefaultInterpreter() {
-    throw new Exception('Incomplete implementation!');
+    throw new PhutilMethodNotImplementedException();
   }
 
   /**