diff --git a/.travis.yml b/.travis.yml
index 83a070b..295d123 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,7 @@ python:
 - 3.6
 install: pip install tox-travis codecov
 # positional args ({posargs}) to pass into tox.ini
-script: tox -- --cov
+script: tox -- --cov --cov-append
 after_success: codecov
 deploy:
   provider: pypi