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-rw-r--r--ext/tk/lib/tkextlib/winico.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/winico.rb b/ext/tk/lib/tkextlib/winico.rb
index ce7b8eac5c..996fc409b8 100644
--- a/ext/tk/lib/tkextlib/winico.rb
+++ b/ext/tk/lib/tkextlib/winico.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# winico -- Windows Icon extension support
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)