diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index <HASH>..<HASH> 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,5 +1,7 @@
-require "simplecov"
-SimpleCov.start
+if RUBY_ENGINE == "ruby"
+  require "simplecov"
+  SimpleCov.start
+end
 
 require "kippt"
 require "rspec"
Changes test coverage to be run only on MRI Ruby

Without this tests will fail in Rubinius <I> mode.