diff --git a/os_net_config/impl_ifcfg.py b/os_net_config/impl_ifcfg.py
index f8e87ae4..75c64ae2 100644
--- a/os_net_config/impl_ifcfg.py
+++ b/os_net_config/impl_ifcfg.py
@@ -431,7 +431,7 @@ class IfcfgNetConfig(os_net_config.NetConfig):
             data += "TYPE=Infiniband\n"
             data += "PKEY=yes\n"
             data += "PHYSDEV=%s\n" % base_opt.parent
-            data += "PKEY_ID=%d\n" % base_opt.pkey_id
+            data += "PKEY_ID=%s\n" % base_opt.pkey_id
         elif re.match(r'\w+\.\d+$', base_opt.name):
             data += "VLAN=yes\n"
         elif isinstance(base_opt, objects.Interface):
diff --git a/os_net_config/objects.py b/os_net_config/objects.py
index 9e5b99e4..fdaaf8ca 100644
--- a/os_net_config/objects.py
+++ b/os_net_config/objects.py
@@ -1269,9 +1269,9 @@ class IbChildInterface(_BaseOpts):
         routes = routes or []
         rules = rules or []
         dns_servers = dns_servers or []
-        self.pkey_id = pkey_id
-        self.parent = parent
         full_pkey_id = 0x8000 | pkey_id
+        self.pkey_id = hex(full_pkey_id)
+        self.parent = parent
         name = "%s.%04x" % (parent, full_pkey_id)
         nm_controlled = True
         super(IbChildInterface, self).__init__(name, use_dhcp, use_dhcpv6,
diff --git a/os_net_config/tests/test_impl_ifcfg.py b/os_net_config/tests/test_impl_ifcfg.py
index 6c861ab8..af21813c 100644
--- a/os_net_config/tests/test_impl_ifcfg.py
+++ b/os_net_config/tests/test_impl_ifcfg.py
@@ -191,7 +191,7 @@ PEERDNS=no
 TYPE=Infiniband
 PKEY=yes
 PHYSDEV=ib0
-PKEY_ID=1
+PKEY_ID=0x8001
 BOOTPROTO=none
 """
 
diff --git a/os_net_config/tests/test_objects.py b/os_net_config/tests/test_objects.py
index b4a87fe6..00d54ff8 100644
--- a/os_net_config/tests/test_objects.py
+++ b/os_net_config/tests/test_objects.py
@@ -1622,14 +1622,14 @@ class TestIbChildInterface(base.TestCase):
 
     def test_ib_child_interface_pkey_id_valid(self):
         ib_child_interface = objects.IbChildInterface('foo', pkey_id=100)
-        self.assertEqual(100, ib_child_interface.pkey_id)
+        self.assertEqual("0x8064", ib_child_interface.pkey_id)
 
     def test_ib_child_interface_pkey_id_hexa(self):
         data = '{"type": "ib_child_interface", ' \
                '"parent": "foo", "pkey_id": "0x64"}'
         ib_child_interface = \
             objects.IbChildInterface.from_json(json.loads(data))
-        self.assertEqual(100, ib_child_interface.pkey_id)
+        self.assertEqual("0x8064", ib_child_interface.pkey_id)
 
     def test_ib_child_interface_pkey_id_invalid_base(self):
         data = '{"type": "ib_child_interface", ' \