1 files changed, 1 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index dfae569cf..834e8e78a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,6 +13,7 @@ passenv =
     PERL
     PERL5LIB
     PYTEST_ADDOPTS
+    DO_EPUBCHECK
     EPUBCHECK_PATH
     TERM
 description =