diff --git a/osx/preference-delegate.h b/osx/preference-delegate.h
index fdc48bd..03022bd 100644
--- a/osx/preference-delegate.h
+++ b/osx/preference-delegate.h
@@ -1,4 +1,4 @@
-/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/* -*- Mode: objc; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
 /*
  * @copyright See LICENCE for copyright and license information.
  *