diff --git a/tox.ini b/tox.ini
index 79ea939..ad0aa31 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@
          STATSD_PORT=8125
          VIRTUAL_ENV={envdir}
          OS_TEST_TIMEOUT=30
-passenv = ZUUL_TEST_ROOT
+passenv = ZUUL_TEST_ROOT OS_STDOUT_CAPTURE OS_STDERR_CAPTURE OS_LOG_CAPTURE
 usedevelop = True
 install_command = pip install {opts} {packages}
 deps = -r{toxinidir}/requirements.txt