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-rw-r--r--activesupport/lib/active_support/core_ext/string/interpolation.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/core_ext/string/interpolation.rb b/activesupport/lib/active_support/core_ext/string/interpolation.rb
index 41a061c1a4..2048d35091 100644
--- a/activesupport/lib/active_support/core_ext/string/interpolation.rb
+++ b/activesupport/lib/active_support/core_ext/string/interpolation.rb
@@ -5,7 +5,7 @@
You may redistribute it and/or modify it under the same license terms as Ruby.
=end
-if RUBY_VERSION < '1.9'
+if RUBY_VERSION < '1.9' && !"".respond_to?(:interpolate_without_ruby_19_syntax)
# KeyError is raised by String#% when the string contains a named placeholder
# that is not contained in the given arguments hash. Ruby 1.9 includes and