diff --git a/nova/tests/fixtures.py b/nova/tests/fixtures.py
index e3cee3606c30..81e6d72fc15f 100644
--- a/nova/tests/fixtures.py
+++ b/nova/tests/fixtures.py
@@ -864,7 +864,7 @@ class WarningsFixture(fixtures.Fixture):
         # TODO(mriedem): Change (or remove) this DeprecationWarning once
         # https://bugs.launchpad.net/sqlalchemy-migrate/+bug/1814288 is fixed.
         warnings.filterwarnings(
-            'ignore', message='inspect\.getargspec\(\) is deprecated',
+            'ignore', message=r'inspect.getargspec\(\) is deprecated',
             category=DeprecationWarning,
             module='migrate.versioning.script.py')