diff --git a/.travis.yml b/.travis.yml
index 943d0d3..d27e5e1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,7 @@ matrix:
     - rvm: 1.9.3
     - rvm: 1.9.2
     - rvm: 1.8.7
+    - rvm: rbx-2.2.3
 env:
   - CXX=g++-4.8
   - CXX=clang++