diff --git a/lib/dm-types/enum.rb b/lib/dm-types/enum.rb
index 3578ed4..973a4be 100644
--- a/lib/dm-types/enum.rb
+++ b/lib/dm-types/enum.rb
@@ -5,7 +5,7 @@ module DataMapper
   class Property
     class Enum < Integer
 
-      include Flags
+      include Types::Support::Flags
 
       def initialize(model, name, options = {})
         super
@@ -19,10 +19,8 @@ def initialize(model, name, options = {})
 
         if defined?(::DataMapper::Validations)
           unless model.skip_auto_validation_for?(self)
-            if self.class.ancestors.include?(Property::Enum)
-              allowed = flag_map.values_at(*flag_map.keys.sort)
-              model.validates_within name, model.options_with_message({ :set => allowed }, self, :within)
-            end
+            allowed = flag_map.values_at(*flag_map.keys.sort)
+            model.validates_within name, model.options_with_message({ :set => allowed }, self, :within)
           end
         end
       end
diff --git a/lib/dm-types/flag.rb b/lib/dm-types/flag.rb
index f9a24d5..43ce396 100644
--- a/lib/dm-types/flag.rb
+++ b/lib/dm-types/flag.rb
@@ -5,7 +5,7 @@ module DataMapper
   class Property
     class Flag < Integer
 
-      include Flags
+      include Types::Support::Flags
 
       def initialize(model, name, options = {})
         super
diff --git a/lib/dm-types/paranoid_boolean.rb b/lib/dm-types/paranoid_boolean.rb
index b03364e..6c6d4e1 100644
--- a/lib/dm-types/paranoid_boolean.rb
+++ b/lib/dm-types/paranoid_boolean.rb
@@ -8,15 +8,12 @@ class ParanoidBoolean < Boolean
 
       # @api private
       def bind
-        property_name = name.inspect
+        unless model < DataMapper::Types::Paranoid::Base
+          model.__send__ :include, DataMapper::Types::Paranoid::Base
+        end
 
-        model.class_eval <<-RUBY, __FILE__, __LINE__ + 1
-          include DataMapper::Types::Paranoid::Base
-
-          set_paranoid_property(#{property_name}) { true }
-
-          default_scope(#{repository_name.inspect}).update(#{property_name} => false)
-        RUBY
+        model.set_paranoid_property(name) { true }
+        model.default_scope(repository_name).update(name => false)
       end
     end # class ParanoidBoolean
   end # module Property
diff --git a/lib/dm-types/paranoid_datetime.rb b/lib/dm-types/paranoid_datetime.rb
index e70dafe..6fa0711 100644
--- a/lib/dm-types/paranoid_datetime.rb
+++ b/lib/dm-types/paranoid_datetime.rb
@@ -7,15 +7,12 @@ class ParanoidDateTime < DateTime
 
       # @api private
       def bind
-        property_name = name.inspect
+        unless model < DataMapper::Types::Paranoid::Base
+          model.__send__ :include, DataMapper::Types::Paranoid::Base
+        end
 
-        model.class_eval <<-RUBY, __FILE__, __LINE__ + 1
-          include DataMapper::Types::Paranoid::Base
-
-          set_paranoid_property(#{property_name}) { ::DateTime.now }
-
-          default_scope(#{repository_name.inspect}).update(#{property_name} => nil)
-        RUBY
+        model.set_paranoid_property(name) { ::DateTime.now }
+        model.default_scope(repository_name).update(name => nil)
       end
     end # class ParanoidDateTime
   end # module Property
diff --git a/lib/dm-types/support/flags.rb b/lib/dm-types/support/flags.rb
index 1599b85..d912d87 100644
--- a/lib/dm-types/support/flags.rb
+++ b/lib/dm-types/support/flags.rb
@@ -1,41 +1,40 @@
 module DataMapper
-  class Property
-    module Flags
-      def self.included(base)
-        base.class_eval <<-RUBY, __FILE__, __LINE__ + 1
-          extend DataMapper::Property::Flags::ClassMethods
+  module Types
+    module Support
+      module Flags
+        def self.included(model)
+          model.extend ClassMethods
+          model.accept_options :flags
+          model.__send__ :attr_reader, :flag_map
+          model.instance_variable_set(:@generated_classes, {})
 
-          accept_options :flags
-          attr_reader :flag_map
-
-          class << self
+          class << model
             attr_accessor :generated_classes
           end
+        end
 
-          self.generated_classes = {}
-        RUBY
-      end
-
-      def custom?
-        true
-      end
+        def custom?
+          true
+        end
 
-      module ClassMethods
-        # TODO: document
-        # @api public
-        def [](*values)
-          if klass = generated_classes[values.flatten]
-            klass
-          else
-            klass = ::Class.new(self)
-            klass.flags(values)
+        module ClassMethods
+          # TODO: document
+          # @api public
+          def [](*values)
+            if klass = generated_classes[values.flatten]
+              klass
+            else
+              klass = ::Class.new(self)
+              klass.flags(values)
 
-            generated_classes[values.flatten] = klass
+              generated_classes[values.flatten] = klass
 
-            klass
+              klass
+            end
           end
-        end
-      end
-    end
-  end
-end
+        end # module ClassMethods
+
+      end # module Flags
+    end # module Support
+  end # module Types
+end # module DataMapper