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-rw-r--r--actionpack/lib/action_controller/metal/responder.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_controller/metal/responder.rb b/actionpack/lib/action_controller/metal/responder.rb
index a16ed97131..c6e847ba0f 100644
--- a/actionpack/lib/action_controller/metal/responder.rb
+++ b/actionpack/lib/action_controller/metal/responder.rb
@@ -95,7 +95,7 @@ module ActionController #:nodoc:
delegate :get?, :post?, :put?, :delete?, :to => :request
# Undefine :to_json since it's defined on Object
- undef_method :to_json
+ undef_method(:to_json) if method_defined?(:to_json)
# Initializes a new responder an invoke the proper format. If the format is
# not defined, call to_format.