diff --git a/html5lib/tests/test_sanitizer.py b/html5lib/tests/test_sanitizer.py
index f3faeb80..6ad43a3a 100644
--- a/html5lib/tests/test_sanitizer.py
+++ b/html5lib/tests/test_sanitizer.py
@@ -1,9 +1,14 @@
 from __future__ import absolute_import, division, unicode_literals
 
+import warnings
+
 import pytest
 
 from html5lib import constants, parseFragment, serialize
-from html5lib.filters import sanitizer
+
+with warnings.catch_warnings():
+    warnings.simplefilter("ignore", DeprecationWarning)
+    from html5lib.filters import sanitizer
 
 
 def sanitize_html(stream):
diff --git a/pytest.ini b/pytest.ini
index 8824977a..1f620d98 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,6 +1,6 @@
 [pytest]
 # Output fails, errors, xpass, and warnings; ignore doctest; make warnings errors
-addopts = -rfEXw -p no:doctest --strict
+addopts = -rfEXw -p no:doctest --strict-markers
 
 # Make xpass results be considered fail
 xfail_strict = true