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-rw-r--r--ext/tk/lib/tk/bgerror.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/bgerror.rb b/ext/tk/lib/tk/bgerror.rb
index c82a8e046b..9d2f59357e 100644
--- a/ext/tk/lib/tk/bgerror.rb
+++ b/ext/tk/lib/tk/bgerror.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkbgerror -- bgerror ( tkerror ) module
# 1998/07/16 by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>