diff --git a/.travis.yml b/.travis.yml
index cdb8a7a..d74e515 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,19 +4,14 @@ env:
   # CentOS 7.
   - container_id: $(mktemp)
     distribution: centos
-    version: "7"
+    version: 7
     init: /usr/lib/systemd/systemd
     run_opts: "--privileged --volume=/sys/fs/cgroup:/sys/fs/cgroup:ro"
-  # Ubuntu 12.04.
-  # - container_id: $(mktemp)
-  #   distribution: ubuntu
-  #   version: precise
-  #   init: /sbin/init
-  #   run_opts: ""
+
   # Ubuntu 14.04.
   - container_id: $(mktemp)
     distribution: ubuntu
-    version: trusty
+    version: 14.04
     init: /sbin/init
     run_opts: ""
 
@@ -28,11 +23,11 @@ before_install:
   # Pull container.
   - "sudo docker pull ${distribution}:${version}"
   # Customize container.
-  - "sudo docker build --rm=true --file=tests/Dockerfile.${distribution}${version} --tag=${distribution}${version}:ansible tests"
+  - "sudo docker build --rm=true --file=tests/Dockerfile.${distribution} --tag=${distribution}:ansible tests"
 
 script:
   # Run container in detached state.
-  - 'sudo docker run --detach --volume="${PWD}":/etc/ansible/roles/role_under_test:ro ${run_opts} ${distribution}${version}:ansible "${init}" > "${container_id}"'
+  - sudo docker run --detach --volume="${PWD}":/etc/ansible/roles/role_under_test:ro ${run_opts} ${distribution}:ansible "${init}" > "${container_id}"
 
   # Ansible syntax check.
   - 'sudo docker exec --tty "$(cat ${container_id})" env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/test.yml --syntax-check'