diff --git a/tox.ini b/tox.ini
index 1a71053c4..46e4c01d7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,7 @@ envlist = py32, py33, py34
 # Change dir to avoid import problem
 changedir = docs
 commands = {envpython} -m borg.testsuite.run -bv []
+passenv = *  # fakeroot -u needs some env vars
 
 [testenv:py32]
 deps = mock