--- a/Rakefile
+++ b/Rakefile
@@ -91,4 +91 @@
-# Only run coverage tests on MRI. SimpleCov is supported on JRuby 9.1, but
-# generates warnings. It is not supported on Rubinius.
-TEST_COVERAGE = RUBY_ENGINE == 'ruby'
-ENV['TEST_COVERAGE'] = TEST_COVERAGE ? '1' : '0'
+ENV['TEST_COVERAGE'] = '0'