diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb
index fd8c1da842..af7e46e649 100644
--- a/activerecord/lib/active_record/attribute_methods.rb
+++ b/activerecord/lib/active_record/attribute_methods.rb
@@ -24,7 +24,7 @@ module ActiveRecord
 
     RESTRICTED_CLASS_METHODS = %w(private public protected allocate new name parent superclass)
 
-    class GeneratedAttributeMethods < Module #:nodoc:
+    class GeneratedAttributeMethodsBuilder < Module #:nodoc:
       include Mutex_m
     end
 
@@ -35,7 +35,8 @@ module ActiveRecord
       end
 
       def initialize_generated_modules # :nodoc:
-        @generated_attribute_methods = GeneratedAttributeMethods.new
+        @generated_attribute_methods = const_set(:GeneratedAttributeMethods, GeneratedAttributeMethodsBuilder.new)
+        private_constant :GeneratedAttributeMethods
         @attribute_methods_generated = false
         include @generated_attribute_methods
 
@@ -88,7 +89,7 @@ module ActiveRecord
           # If ThisClass < ... < SomeSuperClass < ... < Base and SomeSuperClass
           # defines its own attribute method, then we don't want to overwrite that.
           defined = method_defined_within?(method_name, superclass, Base) &&
-            ! superclass.instance_method(method_name).owner.is_a?(GeneratedAttributeMethods)
+            ! superclass.instance_method(method_name).owner.is_a?(GeneratedAttributeMethodsBuilder)
           defined || super
         end
       end
diff --git a/activerecord/test/cases/attribute_methods_test.rb b/activerecord/test/cases/attribute_methods_test.rb
index f51c87ef2b..9fd62dcf72 100644
--- a/activerecord/test/cases/attribute_methods_test.rb
+++ b/activerecord/test/cases/attribute_methods_test.rb
@@ -1083,7 +1083,7 @@ class AttributeMethodsTest < ActiveRecord::TestCase
 
   test "generated attribute methods ancestors have correct class" do
     mod = Topic.send(:generated_attribute_methods)
-    assert_match %r(GeneratedAttributeMethods), mod.inspect
+    assert_match %r(Topic::GeneratedAttributeMethods), mod.inspect
   end
 
   private