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-rw-r--r--ext/tk/lib/tk/busy.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/busy.rb b/ext/tk/lib/tk/busy.rb
index 7f4f89f524..18ebede9dd 100644
--- a/ext/tk/lib/tk/busy.rb
+++ b/ext/tk/lib/tk/busy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/busy.rb: support 'tk busy' command (Tcl/Tk8.6 or later)
#