diff --git a/tox.ini b/tox.ini
index 08b01cf4..1f61eec0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ envlist = py{27,34,35,36,37}{,-cov}
 
 [testenv]
 deps = -rtests/requirements.txt
-passenv = PTVSD_LOG_DIR
+passenv = PTVSD_LOG_DIR TRAVIS
 setenv =
     PTVSD_TEST=1
 commands =