diff --git a/.travis.yml b/.travis.yml
index 3d76a657..479a8955 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,12 +21,12 @@ before_install:
 before_script:
   - docker run -d --name postgres96 postgres:9.6-alpine
   - docker run --link postgres96:postgres96 waisbrot/wait
-  - postgres_ip="$(docker inspect -f "{{ .NetworkSettings.IPAddress }}" postgres96)"
+  - export postgres_ip="$(docker inspect -f "{{ .NetworkSettings.IPAddress }}" postgres96)"
   - docker login -u $ATAT_DOCKER_REGISTRY_USERNAME -p $ATAT_DOCKER_REGISTRY_PASSWORD $ATAT_DOCKER_REGISTRY_URL
   - docker build --tag "${TESTER_IMAGE_NAME}" --add-host "postgreshost:${postgres_ip}" . -f deploy/docker/tester/Dockerfile
 
 script:
-  - docker run "${TESTER_IMAGE_NAME}"
+  - docker run --add-host "postgreshost:${postgres_ip}" "${TESTER_IMAGE_NAME}"
 
 before_deploy:
   - docker build --tag "${PROD_IMAGE_NAME}" . -f deploy/docker/prod/Dockerfile
diff --git a/script/cibuild b/script/cibuild
index e9d01564..387f61b8 100755
--- a/script/cibuild
+++ b/script/cibuild
@@ -4,5 +4,10 @@
 
 source "$(dirname "${0}")"/../script/include/global_header.inc.sh
 
+echo
+echo "DEBUG: Hosts file:"
+cat /etc/hosts
+echo
+
 # Run lint/style checks and unit tests
 source ./script/test