diff --git a/armada/handlers/document.py b/armada/handlers/document.py
index 3039ff15..be317851 100644
--- a/armada/handlers/document.py
+++ b/armada/handlers/document.py
@@ -120,7 +120,7 @@ class ReferenceResolver(object):
                            reference
         """
         ks_sess = ks_utils.get_keystone_session()
-        (new_scheme, foo) = re.subn('^[^+]+\+', '', design_uri.scheme)  # noqa
+        (new_scheme, foo) = re.subn(r'^[^+]+\+', '', design_uri.scheme)
         url = urllib.parse.urlunparse(
             (new_scheme, design_uri.netloc, design_uri.path, design_uri.params,
              design_uri.query, design_uri.fragment))
diff --git a/armada/tests/unit/handlers/test_chartbuilder.py b/armada/tests/unit/handlers/test_chartbuilder.py
index 1b803f13..c499a67d 100644
--- a/armada/tests/unit/handlers/test_chartbuilder.py
+++ b/armada/tests/unit/handlers/test_chartbuilder.py
@@ -461,9 +461,8 @@ class ChartBuilderNegativeTestCase(BaseChartBuilderTestCase):
         chartbuilder = ChartBuilder(test_chart)
 
         # Confirm it failed for both encodings.
-        error_re = (
-            r'.*A str exception occurred while trying to read file:'  # noqa
-            '.*Details:\n.*\(encoding=utf-8\).*\n\(encoding=latin1\)')
+        error_re = (r'.*A str exception occurred while trying to read file:'
+                    r'.*Details:\n.*\(encoding=utf-8\).*\n\(encoding=latin1\)')
         with mock.patch("builtins.open", mock.mock_open(read_data="")) \
                 as mock_file:
             mock_file.return_value.read.side_effect = self.exc_to_raise