diff --git a/tox.ini b/tox.ini
index bc40266c1..b9c12d616 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,7 +28,8 @@ commands =
     format,perf: {envpython} -m pip install '{toxinidir}[format]'
     format_nongpl: {envpython} -m pip install '{toxinidir}[format_nongpl]'
 
-    tests,coverage,codecov: {envpython} -W 'error' -m {env:MAYBE_COVERAGE:} twisted.trial {posargs:jsonschema}
+    # Ignore the deprecation warning until pypa/setuptools#3276 is released
+    tests,coverage,codecov: {envpython} -Werror -W"ignore:module 'sre_constants' is deprecated:DeprecationWarning" -m {env:MAYBE_COVERAGE:} twisted.trial {posargs:jsonschema}
     tests: {envpython} -m doctest {toxinidir}/README.rst
 
     coverage: {envpython} -m coverage report --show-missing