diff --git a/.travis.yml b/.travis.yml
index 8840fbd9..6c7fec0d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,6 +14,8 @@ rvm:
 matrix:
   allow_failures:
     - rvm: ruby-head
+    - rvm: rbx-18mode
+    - rvm: rbx-19mode
 
 notifications:
   irc: "irc.freenode.org#pry"