diff --git a/Gemfile b/Gemfile
index 834e43f8..a4ffa91a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,7 +32,7 @@ gem 'erubis'
 gem 'liquid'
 gem 'slim', '~> 1.0'
 gem 'temple', '!= 0.3.3'
-gem 'RedCloth' if RUBY_VERSION < "1.9.3" and not RUBY_ENGINE.start_with? 'ma'
+gem 'RedCloth' if RUBY_VERSION < "1.9.3" and not RUBY_ENGINE == "macruby"
 gem 'coffee-script', '>= 2.0'
 gem 'rdoc'
 gem 'kramdown'