diff --git a/tox.ini b/tox.ini
index 6142681..142ca43 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,6 +13,7 @@ deps = nose
        hypothesis!=3.56.9
        viivakoodi
 commands = py.test --cov escpos
+passenv = ESCPOS_CAPABILITIES_PICKLE_DIR ESCPOS_CAPABILITIES_FILE CI TRAVIS TRAVIS_* APPVEYOR APPVEYOR_* CODECOV_*
 
 [testenv:docs]
 basepython = python