diff --git a/activemodel/lib/active_model/validations/exclusion.rb b/activemodel/lib/active_model/validations/exclusion.rb
index 3331162bc0..dfeec37ca1 100644
--- a/activemodel/lib/active_model/validations/exclusion.rb
+++ b/activemodel/lib/active_model/validations/exclusion.rb
@@ -9,7 +9,7 @@ module ActiveModel
 
       def validate_each(record, attribute, value)
         if include?(record, value)
-          record.errors.add(attribute, :exclusion, options.except(:in).merge!(:value => value))
+          record.errors.add(attribute, :exclusion, options.except(:in, :within).merge!(:value => value))
         end
       end
     end
diff --git a/activemodel/lib/active_model/validations/inclusion.rb b/activemodel/lib/active_model/validations/inclusion.rb
index c995e28d64..5a679e0423 100644
--- a/activemodel/lib/active_model/validations/inclusion.rb
+++ b/activemodel/lib/active_model/validations/inclusion.rb
@@ -9,7 +9,7 @@ module ActiveModel
 
       def validate_each(record, attribute, value)
         unless include?(record, value)
-          record.errors.add(attribute, :inclusion, options.except(:in).merge!(:value => value))
+          record.errors.add(attribute, :inclusion, options.except(:in, :within).merge!(:value => value))
         end
       end
     end
diff --git a/activemodel/test/cases/validations/i18n_validation_test.rb b/activemodel/test/cases/validations/i18n_validation_test.rb
index bb751cf9c5..4f8b7327c0 100644
--- a/activemodel/test/cases/validations/i18n_validation_test.rb
+++ b/activemodel/test/cases/validations/i18n_validation_test.rb
@@ -159,6 +159,17 @@ class I18nValidationTest < ActiveModel::TestCase
     end
   end
 
+  # validates_inclusion_of using :within w/ mocha
+
+  COMMON_CASES.each do |name, validation_options, generate_message_options|
+    test "validates_inclusion_of using :within on generated message #{name}" do
+      Person.validates_inclusion_of :title, validation_options.merge(:within => %w(a b c))
+      @person.title = 'z'
+      @person.errors.expects(:generate_message).with(:title, :inclusion, generate_message_options.merge(:value => 'z'))
+      @person.valid?
+    end
+  end
+
   # validates_exclusion_of w/ mocha
 
   COMMON_CASES.each do |name, validation_options, generate_message_options|
@@ -170,6 +181,17 @@ class I18nValidationTest < ActiveModel::TestCase
     end
   end
 
+  # validates_exclusion_of using :within w/ mocha
+
+  COMMON_CASES.each do |name, validation_options, generate_message_options|
+    test "validates_exclusion_of using :within generated message #{name}" do
+      Person.validates_exclusion_of :title, validation_options.merge(:within => %w(a b c))
+      @person.title = 'a'
+      @person.errors.expects(:generate_message).with(:title, :exclusion, generate_message_options.merge(:value => 'a'))
+      @person.valid?
+    end
+  end
+
   # validates_numericality_of without :only_integer w/ mocha
 
   COMMON_CASES.each do |name, validation_options, generate_message_options|