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-rw-r--r--ext/psych/lib/psych.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/psych/lib/psych.rb b/ext/psych/lib/psych.rb
index 6c892c5393..464fae499e 100644
--- a/ext/psych/lib/psych.rb
+++ b/ext/psych/lib/psych.rb
@@ -3,6 +3,7 @@ require 'psych/nodes'
require 'psych/visitors'
require 'psych/handler'
require 'psych/tree_builder'
+require 'psych/json/tree_builder'
require 'psych/parser'
require 'psych/omap'
require 'psych/set'