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-rw-r--r--activesupport/lib/active_support/core_ext/string/output_safety.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/core_ext/string/output_safety.rb b/activesupport/lib/active_support/core_ext/string/output_safety.rb
index 5babc297c1..3ee5bcaab4 100644
--- a/activesupport/lib/active_support/core_ext/string/output_safety.rb
+++ b/activesupport/lib/active_support/core_ext/string/output_safety.rb
@@ -1,4 +1,5 @@
-require "erb"
+require 'erb'
+require 'active_support/core_ext/object/singleton_class'
class ERB
module Util