diff --git a/tox.ini b/tox.ini
index 96188f1780..ce00efa870 100644
--- a/tox.ini
+++ b/tox.ini
@@ -40,6 +40,9 @@ passenv =
     NPM_CONFIG_PREFIX
     PYTHON_VERSION
     SCRAPY_SETTINGS_MODULE
+    SELENIUM_BROWSER
+    SELENIUM_HOST
+    SELENIUM_PORT
     SHARD
     SKIP_NPM_INSTALL
     SSH_AUTH_SOCK