diff --git a/tests/conftest.py b/tests/conftest.py
index 83c65fea4..b04698dbe 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -30,6 +30,8 @@ import operator
 import pytest
 import hypothesis
 
+pytest.register_assert_rewrite('helpers')
+
 from helpers import logfail
 from helpers.logfail import fail_on_logging
 from helpers.messagemock import message_mock
diff --git a/tests/end2end/conftest.py b/tests/end2end/conftest.py
index 87bde6422..73d4a87ab 100644
--- a/tests/end2end/conftest.py
+++ b/tests/end2end/conftest.py
@@ -25,6 +25,9 @@ import os
 import shutil
 import pstats
 import os.path
+import pytest
+
+pytest.register_assert_rewrite('end2end.fixtures')
 
 from end2end.fixtures.webserver import httpbin, httpbin_after_test, ssl_server
 from end2end.fixtures.quteprocess import (quteproc_process, quteproc,