diff --git a/.travis.yml b/.travis.yml
index d73aef5d0..2a3b3816e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -93,7 +93,7 @@ script:
   - blt ci:travis:init
   - blt ci:pipelines:init
   # Disable Lightning tests on pull requests.
-  - if [[ "$TRAVIS_PULL_REQUEST" == "true" ]]; then echo 'behat:\n  paths:\n    - ${repo.root}/tests/behat' >> blt/project.yml; fi
+  - if [[ "$TRAVIS_PULL_REQUEST" == "true" ]]; then printf 'behat.paths: [ ${repo.root}/tests/behat ]' >> blt/project.yml; fi
   - cat blt/project.yml
   # Call targets in the new 'blt-project' project.
   - blt ci:build:validate:test -Dcreate_alias=false -Dbehat.run-server=true -Dbehat.launch-phantom=true