1 files changed, 2 insertions, 3 deletions
diff --git a/activesupport/lib/active_support/json/backends/jsongem.rb b/activesupport/lib/active_support/json/backends/jsongem.rb
index 649e6301d1..c6c17a3c4e 100644
--- a/activesupport/lib/active_support/json/backends/jsongem.rb
+++ b/activesupport/lib/active_support/json/backends/jsongem.rb
@@ -2,10 +2,9 @@ require 'json' unless defined?(JSON)
 
 module ActiveSupport
   module JSON
-    ParseError = ::JSON::ParserError unless const_defined?(:ParseError)
-
     module Backends
       module JSONGem
+        ParseError = ::JSON::ParserError
         extend self
 
         # Parses a JSON string or IO and convert it into an object
@@ -38,4 +37,4 @@ module ActiveSupport
       end
     end
   end
-end
-\ No newline at end of file
+end