diff --git a/ironic_inspector/pxe_filter/dnsmasq.py b/ironic_inspector/pxe_filter/dnsmasq.py
index 5c7c56abd..d96d88706 100644
--- a/ironic_inspector/pxe_filter/dnsmasq.py
+++ b/ironic_inspector/pxe_filter/dnsmasq.py
@@ -20,6 +20,10 @@
 #     http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html
 
 
+try:
+    import errno
+except ImportError:
+    import os.errno as errno
 import fcntl
 import os
 import time
@@ -206,7 +210,7 @@ def _exclusive_write_or_pass(path, buf):
                 f.flush()
                 return True
             except IOError as e:
-                if e.errno == os.errno.EWOULDBLOCK:
+                if e.errno == errno.EWOULDBLOCK:
                     LOG.debug('%s locked; will try again (later)', path)
                     attempts -= 1
                     time.sleep(_EXCLUSIVE_WRITE_ATTEMPTS_DELAY)
@@ -261,7 +265,7 @@ def _configure_unknown_hosts():
         if os.stat(path).st_size == len(wildcard_filter):
             return
     except OSError as e:
-        if e.errno != os.errno.ENOENT:
+        if e.errno != errno.ENOENT:
             raise
 
     if _exclusive_write_or_pass(path, '%s' % wildcard_filter):
diff --git a/ironic_inspector/test/unit/test_dnsmasq_pxe_filter.py b/ironic_inspector/test/unit/test_dnsmasq_pxe_filter.py
index fdfbda8a0..2b9511b0e 100644
--- a/ironic_inspector/test/unit/test_dnsmasq_pxe_filter.py
+++ b/ironic_inspector/test/unit/test_dnsmasq_pxe_filter.py
@@ -11,6 +11,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+try:
+    import errno
+except ImportError:
+    import os.errno as errno
 import datetime
 import os
 
@@ -131,7 +135,7 @@ class TestExclusiveWriteOrPass(test_base.BaseTest):
 
     def test_write_would_block(self):
         err = IOError('Oops!')
-        err.errno = os.errno.EWOULDBLOCK
+        err.errno = errno.EWOULDBLOCK
         # lock/unlock paired calls
         self.mock_fcntl.side_effect = [
             # first try
@@ -156,7 +160,7 @@ class TestExclusiveWriteOrPass(test_base.BaseTest):
             'ironic_inspector.pxe_filter.dnsmasq._EXCLUSIVE_WRITE_ATTEMPTS',
             1))
         err = IOError('Oops!')
-        err.errno = os.errno.EWOULDBLOCK
+        err.errno = errno.EWOULDBLOCK
         self.mock_fcntl.side_effect = [err, None]
 
         wrote = dnsmasq._exclusive_write_or_pass(self.path, self.buf)
@@ -180,7 +184,7 @@ class TestExclusiveWriteOrPass(test_base.BaseTest):
     def test_write_custom_ioerror(self):
 
         err = IOError('Oops!')
-        err.errno = os.errno.EBADF
+        err.errno = errno.EBADF
         self.mock_fcntl.side_effect = [err, None]
 
         self.assertRaisesRegex(