diff --git a/lib/json/common.rb b/lib/json/common.rb
index 320df2a94..6393a6df5 100644
--- a/lib/json/common.rb
+++ b/lib/json/common.rb
@@ -172,7 +172,7 @@ def generator=(generator) # :nodoc:
         end
       end
       self.state = generator::State
-      const_set :State, self.state
+      const_set :State, state
     ensure
       $VERBOSE = old
     end
@@ -1072,7 +1072,7 @@ def j(*objs)
     end
 
     objs.each do |obj|
-      puts JSON::generate(obj, :allow_nan => true, :max_nesting => false)
+      puts JSON.generate(obj, :allow_nan => true, :max_nesting => false)
     end
     nil
   end
@@ -1087,7 +1087,7 @@ def jj(*objs)
     end
 
     objs.each do |obj|
-      puts JSON::pretty_generate(obj, :allow_nan => true, :max_nesting => false)
+      puts JSON.pretty_generate(obj, :allow_nan => true, :max_nesting => false)
     end
     nil
   end
diff --git a/lib/json/ext.rb b/lib/json/ext.rb
index 1db5ea122..5bacc5e37 100644
--- a/lib/json/ext.rb
+++ b/lib/json/ext.rb
@@ -34,12 +34,12 @@ def parse
 
     if RUBY_ENGINE == 'truffleruby'
       require 'json/truffle_ruby/generator'
-      JSON.generator = ::JSON::TruffleRuby::Generator
+      JSON.generator = JSON::TruffleRuby::Generator
     else
       require 'json/ext/generator'
       JSON.generator = Generator
     end
   end
 
-  JSON_LOADED = true unless defined?(::JSON::JSON_LOADED)
+  JSON_LOADED = true unless defined?(JSON::JSON_LOADED)
 end