diff --git a/.travis.yml b/.travis.yml
index 0d18ee77..c78f87e2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ before_install:
   - git config user.email "$GIT_EMAIL"
   - git config credential.helper "store --file=.git/credentials"
   - echo "https://$GH_TOKEN:@github.com" > .git/credentials
+  - gem install asciidoctor
 install:
 - mvn --settings .settings.xml install -P docs -q -U -DskipTests=true -Dmaven.test.redirectTestOutputToFile=true
 - ./docs/src/main/asciidoc/ghpages.sh