1 files changed, 1 insertions, 0 deletions
diff --git a/ext/extmk.rb b/ext/extmk.rb
index bed183034a..737e5bfdd4 100755
--- a/ext/extmk.rb
+++ b/ext/extmk.rb
@@ -1,5 +1,6 @@
 #! /usr/local/bin/ruby
 # -*- mode: ruby; coding: us-ascii -*-
+# frozen_string_literal: false
 
 # :stopdoc:
 $extension = nil