1 files changed, 1 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index b8d6a0e32..16ea8f9ba 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,7 +5,7 @@ envlist = docs,flake8,mypy,coverage,py{27,34,35,36,py},du{11,12,13,14}
 [testenv]
 usedevelop = True
 passenv =
-    https_proxy http_proxy no_proxy PERL PERL5LIB PYTEST_ADDOPTS
+    https_proxy http_proxy no_proxy PERL PERL5LIB PYTEST_ADDOPTS EPUBCHECK_PATH
 description =
     py{27,34,35,36,py}: Run unit tests against {envname}.
     du{11,12,13,14}: Run unit tests with the given version of docutils.