diff --git a/os_vif/objects/fields.py b/os_vif/objects/fields.py
index 6c4a09f3..bfe0a92f 100644
--- a/os_vif/objects/fields.py
+++ b/os_vif/objects/fields.py
@@ -12,21 +12,25 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import re
+
 from oslo_versionedobjects import fields
+import six
 
 from os_vif.i18n import _LE
 
-import re
-
 
 class PCIAddress(fields.FieldType):
+
+    _REGEX = re.compile(r'^[0-9a-f]{4}:[0-9a-f]{2}:[0-1][0-9a-f].[0-7]$')
+
     @staticmethod
     def coerce(obj, attr, value):
-        m = "[0-9a-f]{1,4}:[0-9a-f]{1,2}:[0-9a-f]{1,2}.[0-9a-f]"
-        newvalue = value.lower()
-        if not re.match(m, newvalue):
-            raise ValueError(_LE("Malformed PCI address %s"), value)
-        return newvalue
+        if isinstance(value, six.string_types):
+            newvalue = value.lower()
+            if PCIAddress._REGEX.match(newvalue):
+                return newvalue
+        raise ValueError(_LE("Malformed PCI address %s"), value)
 
 
 class PCIAddressField(fields.AutoTypedField):
diff --git a/os_vif/tests/test_fields.py b/os_vif/tests/test_fields.py
new file mode 100755
index 00000000..37465088
--- /dev/null
+++ b/os_vif/tests/test_fields.py
@@ -0,0 +1,36 @@
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from oslo_versionedobjects.tests import test_fields
+
+from os_vif.objects import fields
+
+
+class TestPCIAddress(test_fields.TestField):
+    def setUp(self):
+        super(TestPCIAddress, self).setUp()
+        self.field = fields.PCIAddressField()
+        self.coerce_good_values = [
+            ('0000:02:00.0', '0000:02:00.0'),
+            ('FFFF:FF:1F.7', 'ffff:ff:1f.7'),
+            ('fFfF:fF:1F.7', 'ffff:ff:1f.7'),
+        ]
+        self.coerce_bad_values = [
+            '000:02:00.0',  # Too short
+            '00000:02:00.0',  # Too long
+            'FFFF:FF:2F.7',  # Bad slot
+            'FFFF:GF:1F.7',  # Bad octal
+            1123123,  # Number
+            {},  # dict
+        ]
+        self.to_primitive_values = self.coerce_good_values[0:1]
+        self.from_primitive_values = self.coerce_good_values[0:1]
diff --git a/os_vif/tests/test_vif.py b/os_vif/tests/test_vif.py
index de951d8c..4bb4ab77 100644
--- a/os_vif/tests/test_vif.py
+++ b/os_vif/tests/test_vif.py
@@ -79,13 +79,13 @@ class TestVIFS(base.TestCase):
 
     def test_vif_host_dev_plain(self):
         self._test_vif(objects.vif.VIFHostDevice,
-                       dev_address="02:24:22.3",
+                       dev_address="0002:24:12.3",
                        vlan=8)
 
     def test_vif_host_dev_vepa_qbh(self):
         prof = objects.vif.VIFPortProfile8021Qbh(
             profile_id="fishfood")
         self._test_vif(objects.vif.VIFHostDevice,
-                       dev_address="02:24:22.3",
+                       dev_address="0002:24:12.3",
                        vlan=8,
                        port_profile=prof)