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-rw-r--r--activesupport/lib/active_support/core_ext/date_time/conversions.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/core_ext/date_time/conversions.rb b/activesupport/lib/active_support/core_ext/date_time/conversions.rb
index 7f13873e7f..c86a527045 100644
--- a/activesupport/lib/active_support/core_ext/date_time/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/date_time/conversions.rb
@@ -5,7 +5,7 @@ module ActiveSupport #:nodoc:
module Conversions
def self.included(base) #:nodoc:
base.class_eval do
- alias_method :to_default_s, :to_s
+ alias_method :to_default_s, :to_s if instance_methods.include?(:to_s)
alias_method :to_s, :to_formatted_s
alias_method :default_inspect, :inspect
alias_method :inspect, :readable_inspect