diff --git a/.travis.yml b/.travis.yml
index 13f6528e2..7fac8d2f7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,7 @@ language: java
 jdk:
   - openjdk7
   - oraclejdk8
+  - oraclejdk9
 
 # No need for preliminary install step.
 install: true