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-rw-r--r--ext/psych/lib/psych/visitors/yaml_tree.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/psych/lib/psych/visitors/yaml_tree.rb b/ext/psych/lib/psych/visitors/yaml_tree.rb
index 6ad30d2683..e7c7a99060 100644
--- a/ext/psych/lib/psych/visitors/yaml_tree.rb
+++ b/ext/psych/lib/psych/visitors/yaml_tree.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'psych/tree_builder'
require 'psych/scalar_scanner'
require 'psych/class_loader'