diff --git a/.travis.yml b/.travis.yml
index ce5390a3a..796ceaa60 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,11 @@ scala:
   - 2.11.12
   - 2.12.4
 
+matrix:
+  include:
+  - scala: 2.12.4
+    jdk: oraclejdk9
+
 script:
   - sbt -Dfile.encoding=UTF8 -J-XX:ReservedCodeCacheSize=256M "++$TRAVIS_SCALA_VERSION" mimaReportBinaryIssues scalafmt::test test:scalafmt::test test