diff --git a/.travis.yml b/.travis.yml
index ae4d78a31fd395d371c587a453818abe4581ae9d..20062910521985befb1d8c1213fcce034bf1a007 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -100,7 +100,7 @@ matrix:
     - rvm: jruby-9.1.7.0
       jdk: oraclejdk8
       env:
-        - "GEM=am,aj"
+        - "GEM=am,amo,aj"
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-9.1.7.0