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-rw-r--r--activesupport/lib/active_support/core_ext/date_time/calculations.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/core_ext/date_time/calculations.rb b/activesupport/lib/active_support/core_ext/date_time/calculations.rb
index 41cf020f94..e93abfa4a3 100644
--- a/activesupport/lib/active_support/core_ext/date_time/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/date_time/calculations.rb
@@ -1,4 +1,4 @@
-require 'rational'
+require 'rational' unless RUBY_VERSION >= '1.9.2'
class DateTime
class << self