diff --git a/ext/fcntl/extconf.rb b/ext/fcntl/extconf.rb
index 35371ebe18..6998f77483 100644
--- a/ext/fcntl/extconf.rb
+++ b/ext/fcntl/extconf.rb
@@ -1,3 +1,3 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 require 'mkmf'
 create_makefile('fcntl')