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-rw-r--r--ext/nkf/extconf.rb1
-rw-r--r--ext/nkf/lib/kconv.rb1
2 files changed, 2 insertions, 0 deletions
diff --git a/ext/nkf/extconf.rb b/ext/nkf/extconf.rb
index 710662f19c..f41f6b11dc 100644
--- a/ext/nkf/extconf.rb
+++ b/ext/nkf/extconf.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: false
require 'mkmf'
create_makefile('nkf')
diff --git a/ext/nkf/lib/kconv.rb b/ext/nkf/lib/kconv.rb
index f8c1ae8f59..f52b755288 100644
--- a/ext/nkf/lib/kconv.rb
+++ b/ext/nkf/lib/kconv.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# kconv.rb - Kanji Converter.
#