diff --git a/.travis.yml b/.travis.yml
index 2e89ebf..6a86b1a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,7 +23,8 @@ install:
     - docker build --tag=britney .
 
 script:
-    - docker run britney /bin/sh -c "export CI=true ; ci/run-everything-and-upload-to-codecov.io.sh"
+    # https://docs.codecov.io/docs/testing-with-docker
+    - ci_env=$(bash <(curl -s https://codecov.io/env)) ; docker run $ci_env britney /bin/sh -c "export CI=true ; ci/run-everything-and-upload-to-codecov.io.sh"
 
 #notifications:
 #  email: false