diff --git a/src/aphront/AphrontController.php b/src/aphront/AphrontController.php
index df6cff6abc..97a5fc1fd1 100644
--- a/src/aphront/AphrontController.php
+++ b/src/aphront/AphrontController.php
@@ -83,7 +83,7 @@ abstract class AphrontController extends Phobject {
   }
 
   public function getDefaultResourceSource() {
-    throw new MethodNotImplementedException(
+    throw new PhutilMethodNotImplementedException(
       pht(
         'A Controller must implement %s before you can invoke %s or %s.',
         'getDefaultResourceSource()',