1 files changed, 16 insertions, 3 deletions
diff --git a/ext/json/lib/json/ext.rb b/ext/json/lib/json/ext.rb
index a5e3148c57..1fbc3fd7d1 100644
--- a/ext/json/lib/json/ext.rb
+++ b/ext/json/lib/json/ext.rb
@@ -4,12 +4,25 @@ module JSON
   # This module holds all the modules/classes that implement JSON's
   # functionality as C extensions.
   module Ext
-    require 'json/ext/parser'
-    require 'json/ext/generator'
+    begin
+      if defined?(RUBY_ENGINE) == 'constant' and RUBY_ENGINE == 'ruby' and RUBY_VERSION =~ /\A1\.9\./
+        require 'json/ext/1.9/parser'
+        require 'json/ext/1.9/generator'
+      elsif !defined?(RUBY_ENGINE) && RUBY_VERSION =~ /\A1\.8\./
+        require 'json/ext/1.8/parser'
+        require 'json/ext/1.8/generator'
+      else
+        require 'json/ext/parser'
+        require 'json/ext/generator'
+      end
+    rescue LoadError
+      require 'json/ext/parser'
+      require 'json/ext/generator'
+    end
     $DEBUG and warn "Using Ext extension for JSON."
     JSON.parser = Parser
     JSON.generator = Generator
   end
 
-  JSON_LOADED = true unless const_defined?(:JSON_LOADED)
+  JSON_LOADED = true unless defined?(::JSON::JSON_LOADED)
 end