diff --git a/.travis.yml b/.travis.yml
index 2f5898ae4..62088270f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,8 +11,6 @@ rvm:
   - jruby-9.0.5.0
   - jruby-9.1.0.0
   - jruby-head
-  - rbx-2
-  - rbx
 before_install:
   - gem install bundler --no-document
 before_script:
diff --git a/test/helper.rb b/test/helper.rb
index 7eb560eea..f8f1fe106 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -115,9 +115,5 @@ 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 895c6a05d..f86d4249b 100644
--- a/test/test_private_reader.rb
+++ b/test/test_private_reader.rb
@@ -24,7 +24,6 @@ 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