diff --git a/.travis.yml b/.travis.yml
index 934403400..2f5898ae4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,11 +18,6 @@ before_install:
 before_script:
   - unset JRUBY_OPTS
 script: ruby -Ilib exe/rake
-matrix:
-  allow_failures:
-    - rvm: jruby-head
-    - rvm: rbx
-    - rvm: rbx-2
 notifications:
   email:
   - hsbt@ruby-lang.org
diff --git a/test/helper.rb b/test/helper.rb
index f8f1fe106..7eb560eea 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -115,5 +115,9 @@ def jruby9?
     jruby? && (JRUBY_VERSION >= '9.0.0.0')
   end
 
+  def rbx?
+    RUBY_ENGINE == 'rbx'
+  end
+
   include RakefileDefinitions
 end
diff --git a/test/test_private_reader.rb b/test/test_private_reader.rb
index f86d4249b..895c6a05d 100644
--- a/test/test_private_reader.rb
+++ b/test/test_private_reader.rb
@@ -24,6 +24,7 @@ def setup
   end
 
   def test_private_reader_is_private
+    skip if rbx?
     assert_private do @sample.reader end
     assert_private do @sample.a end
   end