diff --git a/ec2_rule_transformer.py b/ec2_rule_transformer.py
index d6731f8..a2e57ea 100644
--- a/ec2_rule_transformer.py
+++ b/ec2_rule_transformer.py
@@ -9,7 +9,7 @@ class EC2RuleTransformer:
 
     def to_rule(self, ec2_rule):
         rule_args = deepcopy(vars(ec2_rule))
-        del rule_args['grants']
+        self._delete_unused_rule_args(rule_args)
 
         if ec2_rule.grants[0].cidr_ip:
             rule_args['ip_range'] = ec2_rule.grants[0].cidr_ip
@@ -17,4 +17,8 @@ class EC2RuleTransformer:
             group_id = ec2_rule.grants[0].group_id
             rule_args['group_name'] = self.ec2_connection.get_all_security_groups(group_ids=group_id)[0].name
 
-        return Rule(**rule_args)
\ No newline at end of file
+        return Rule(**rule_args)
+
+    def _delete_unused_rule_args(self, rule_args):
+        del rule_args['grants']
+        del rule_args['parent']
\ No newline at end of file
diff --git a/openstack_rule_transformer.py b/openstack_rule_transformer.py
index b78ed4e..5a84cb9 100644
--- a/openstack_rule_transformer.py
+++ b/openstack_rule_transformer.py
@@ -7,9 +7,16 @@ class OpenstackRuleTransformer:
     def to_rule(self, openstack_rule):
         rule_args = deepcopy(openstack_rule)
 
+        self._delete_unused_rule_args(rule_args)
+
         if 'cidr' in openstack_rule['ip_range']:
             rule_args['ip_range'] = openstack_rule['ip_range']['cidr']
         else:
             rule_args['group_name'] = openstack_rule['group']['name']
 
-        return Rule(**openstack_rule)
\ No newline at end of file
+        return Rule(**rule_args)
+
+    def _delete_unused_rule_args(self, rule_args):
+        del rule_args['group']
+        del rule_args['parent_group_id']
+        del rule_args['id']
\ No newline at end of file
diff --git a/tests/unit/fake_ec2_rule_builder.py b/tests/unit/fake_ec2_rule_builder.py
index 1dd43d6..bf6ccb1 100644
--- a/tests/unit/fake_ec2_rule_builder.py
+++ b/tests/unit/fake_ec2_rule_builder.py
@@ -2,7 +2,7 @@ from collections import namedtuple
 
 class FakeEC2RuleBuilder():
 
-    EC2Rule = namedtuple('EC2Rule', 'ip_protocol from_port to_port grants')
+    EC2Rule = namedtuple('EC2Rule', 'ip_protocol from_port to_port grants parent')
     GroupOrCIDR = namedtuple('GroupOrCIDR', 'cidr_ip group_id')
 
     def __init__(self):
@@ -11,6 +11,7 @@ class FakeEC2RuleBuilder():
         self.to_port = '3333'
         self.ip_range = '0.0.0.0/0'
         self.allowed_security_group_id = None
+        self.parent = None
 
     @staticmethod
     def an_ec2_rule():
@@ -40,4 +41,4 @@ class FakeEC2RuleBuilder():
 
     def build(self):
         grants = [self.GroupOrCIDR(self.ip_range, self.allowed_security_group_id)]
-        return self.EC2Rule(self.ip_protocol, self.from_port, self.to_port, grants)
+        return self.EC2Rule(self.ip_protocol, self.from_port, self.to_port, grants, self.parent)
diff --git a/tests/unit/test_openstack_rule_transformer.py b/tests/unit/test_openstack_rule_transformer.py
new file mode 100644
index 0000000..6256455
--- /dev/null
+++ b/tests/unit/test_openstack_rule_transformer.py
@@ -0,0 +1,22 @@
+import unittest
+
+from nova.virt.ec2.openstack_rule_transformer import OpenstackRuleTransformer
+
+
+class TestEC2RuleTransformer(unittest.TestCase):
+
+    def setUp(self):
+        self.openstack_rule_transformer = OpenstackRuleTransformer()
+
+    def test_should_copy_to_port(self):
+        openstack_rule = {
+            'ip_protocol': 'abc',
+            'from_port': 123,
+            'to_port': 456,
+            'group': {},
+            'parent_group_id': 55,
+            'ip_range': {'cidr': '9.8.7.6/55'},
+            'id': 18
+        }
+        rule = self.openstack_rule_transformer.to_rule(openstack_rule)
+        self.assertEqual(rule.to_port, openstack_rule['to_port'])
\ No newline at end of file