diff --git a/Gemfile b/Gemfile
index bcf035d..19aafc7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,6 +2,6 @@ source :rubygems
 
 gemspec
 
-gem "rcov", :platforms => :mri_18
+gem "rcov", :group => :test, :platforms => :mri_18
 gem "erubis", "~> 2.7"