diff --git a/ci/ci_build.rb b/ci/ci_build.rb
index 06e513f9072..101edce77b3 100755
--- a/ci/ci_build.rb
+++ b/ci/ci_build.rb
@@ -21,6 +21,7 @@ cd "#{root_dir}/activesupport" do
   puts "[CruiseControl] Building ActiveSupport"
   puts
   build_results[:activesupport] = system 'rake'
+  build_results[:activesupport_isolated] = system 'rake isolated_test'
 end
 
 rm_f "#{root_dir}/activerecord/debug.log"