diff --git a/scripts/trigger-dependent-build.sh b/scripts/trigger-dependent-build.sh
index d8438258f..fe83696a8 100755
--- a/scripts/trigger-dependent-build.sh
+++ b/scripts/trigger-dependent-build.sh
@@ -7,4 +7,4 @@
 #     - ./trigger-dependent-build
 #
 
-curl -vvv -s -X POST -H "Content-Type: application/json" -H "Accept: application/json" -H "Travis-API-Version: 3" -H "Authorization: token $auth_token" -d '{"request":{"branch":"master"},"config":{"env":{"ENVIRONMENT=preview"}}}' https://api.travis-ci.org/repo/alphagov%2Fnotifications-functional-tests/requests
+curl -vvv -s -X POST -H "Content-Type: application/json" -H "Accept: application/json" -H "Travis-API-Version: 3" -H "Authorization: token $auth_token" -d '{"request":{"branch":"master"},"config":{"env":{"matrix":["ENVIRONMENT=preview"]}}}' https://api.travis-ci.org/repo/alphagov%2Fnotifications-functional-tests/requests