diff --git a/Gemfile b/Gemfile
index 33a29951d..f0ec5262d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -74,8 +74,9 @@ end
 
 group :test do
   gem "shoulda", "~> 2.11"
-  # Shoulda does not work nice on Ruby 1.9.3 and seems to need test-unit explicitely.
-  gem "test-unit", :platforms => [:mri_19]
+  # Shoulda does not work nice on Ruby 1.9.3 and JRuby 1.7.
+  # It seems to need test-unit explicitely.
+  gem "test-unit", :platforms => [:mri_19, :jruby]
   gem "mocha", "0.12.3"
 end