1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 205f2f87..018f4f58 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,7 +34,7 @@ basepython = python2.7
 whitelist_externals = bash
 commands =
   pylint --min-similarity-lines=10 \
-    --disable=locally-disabled --ignore-imports=y --reports=n xtesting
+    --disable=locally-disabled --ignore-imports=y --reports=n --extension-pkg-whitelist=lxml xtesting
 
 [testenv:yamllint]
 basepython = python2.7