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-rw-r--r--ext/tk/sample/tkhello.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tkhello.rb b/ext/tk/sample/tkhello.rb
index 597c1f6242..02de5ff381 100644
--- a/ext/tk/sample/tkhello.rb
+++ b/ext/tk/sample/tkhello.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require "tk"
TkButton.new(nil,