diff --git a/functionaltests/__init__.py b/functionaltests/__init__.py
index e69de29bb..f96945ffa 100644
--- a/functionaltests/__init__.py
+++ b/functionaltests/__init__.py
@@ -0,0 +1,7 @@
+import logging
+
+logging.basicConfig(
+    filename='functional-tests.log',
+    filemode='w',
+    level=logging.DEBUG,
+)
diff --git a/tox.ini b/tox.ini
index 130a069fe..c5e72a1d9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -67,6 +67,10 @@ usedevelop = False
 setenv = VIRTUAL_ENV={envdir}
          OS_TEST_PATH=functionaltests/
 passenv = TEMPEST_CONFIG
+          OS_STDOUT_CAPTURE
+          OS_STDERR_CAPTURE
+          OS_LOG_CAPTURE
+          OS_DEBUG
 
 [testenv:venv]
 commands = {posargs}