diff --git a/features/open_flow13/copy_field.feature b/features/open_flow13/copy_field.feature
new file mode 100644
index 00000000..0b7b8dca
--- /dev/null
+++ b/features/open_flow13/copy_field.feature
@@ -0,0 +1,21 @@
+@open_flow13
+Feature: Pio::CopyField
+
+  Scenario: new(from: :arp_sender_hardware_address, to: :arp_target_hardware_address)
+    When I try to create an OpenFlow action with:
+      """
+      Pio::CopyField.new(from: :arp_sender_hardware_address, to: :arp_target_hardware_address)
+      """
+    Then it should finish successfully
+    And the action has the following fields and values:
+      | field                  |                        value |
+      | action_type.to_hex     |                       0xffff |
+      | action_length          |                           32 |
+      | experimenter_id.to_hex |                   0x4f4e4600 |
+      | experimenter_type      |                         3200 |
+      | from                   | :arp_sender_hardware_address |
+      | oxm_ids[0].oxm_field   |                           24 |
+      | oxm_ids[0].oxm_length  |                            6 |
+      | to                     | :arp_target_hardware_address |
+      | oxm_ids[1].oxm_field   |                           25 |
+      | oxm_ids[1].oxm_length  |                            6 |
diff --git a/lib/pio/open_flow.rb b/lib/pio/open_flow.rb
index b183e574..bab23bf8 100644
--- a/lib/pio/open_flow.rb
+++ b/lib/pio/open_flow.rb
@@ -21,7 +21,7 @@ def self.switch_version(version)
        :FlowStats, :DescriptionStats, :AggregateStats, :TableStats, :PortStats,
        :QueueStats, :Error, :NiciraResubmit, :SetArpOperation,
        :SetArpSenderProtocolAddress, :SetArpSenderHardwareAddress,
-       :NiciraResubmitTable].each do |each|
+       :NiciraResubmitTable, :CopyField].each do |each|
         set_message_class_name each, version
         @version = version.to_s
       end
diff --git a/lib/pio/open_flow13.rb b/lib/pio/open_flow13.rb
index 29ea0da4..ac786135 100644
--- a/lib/pio/open_flow13.rb
+++ b/lib/pio/open_flow13.rb
@@ -13,6 +13,7 @@
 require 'pio/open_flow13/stats_request'
 
 # Actions
+require 'pio/open_flow13/copy_field'
 require 'pio/open_flow13/send_out_port'
 require 'pio/open_flow13/set_arp_operation'
 require 'pio/open_flow13/set_arp_sender_hardware_address'
diff --git a/lib/pio/open_flow13/copy_field.rb b/lib/pio/open_flow13/copy_field.rb
new file mode 100644
index 00000000..36c12497
--- /dev/null
+++ b/lib/pio/open_flow13/copy_field.rb
@@ -0,0 +1,42 @@
+require 'active_support/core_ext/string/inflections'
+require 'pio/open_flow/action'
+
+module Pio
+  module OpenFlow13
+    # Copy-field action (ONF extension 320)
+    class CopyField < OpenFlow::Action
+      action_header action_type: 0xffff, action_length: 32
+      uint32 :experimenter_id, value: 0x4f4e4600
+      uint16 :experimenter_type, value: 3200
+      string :padding1, length: 2
+      hide :padding1
+      uint16 :n_bits
+      uint16 :source_offset, value: 0
+      uint16 :destination_offset, value: 0
+      string :padding2, length: 2
+      hide :padding2
+      array :oxm_ids, initial_length: 2 do
+        uint16 :oxm_class, value: Match::OXM_CLASS_OPENFLOW_BASIC
+        bit7 :oxm_field
+        bit1 :oxm_hasmask, value: 0
+        uint8 :oxm_length
+      end
+      string :padding3, length: 4
+      hide :padding3
+
+      attr_reader :from
+      attr_reader :to
+
+      def initialize(options)
+        @from = options.fetch(:from)
+        @to = options.fetch(:to)
+        from_klass = Match.const_get(@from.to_s.classify)
+        to_klass = Match.const_get(@to.to_s.classify)
+        super(oxm_ids: [{ oxm_field: from_klass.const_get(:OXM_FIELD),
+                          oxm_length: from_klass.new.length },
+                        { oxm_field: to_klass.const_get(:OXM_FIELD),
+                          oxm_length: to_klass.new.length }])
+      end
+    end
+  end
+end
diff --git a/pio.gemspec b/pio.gemspec
index e4766efe..5d7ecfb5 100644
--- a/pio.gemspec
+++ b/pio.gemspec
@@ -29,6 +29,7 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = '>= 2.0.0'
 
   gem.add_dependency 'bindata', '~> 2.1.0'
+  gem.add_dependency 'activesupport', '~> 4.2', '>= 4.2.4'
 
   gem.add_development_dependency 'bundler', '~> 1.10.6'
   gem.add_development_dependency 'pry', '~> 0.10.3'