diff --git a/lib/rb/Rakefile b/lib/rb/Rakefile
index ef00a9f..8f1c4fe 100644
--- a/lib/rb/Rakefile
+++ b/lib/rb/Rakefile
@@ -38,7 +38,7 @@
 end
 
 desc 'Compile the .thrift files for the specs'
-task :'gen-rb' => [:'gen-rb:spec', :'gen-rb:namespaced_spec', :'gen-rb:benchmark', :'gen-rb:debug_proto']
+task :'gen-rb' => [:'gen-rb:spec', :'gen-rb:namespaced_spec', :'gen-rb:flat_spec', :'gen-rb:benchmark', :'gen-rb:debug_proto']
 namespace :'gen-rb' do
   task :'spec' do
     dir = File.dirname(__FILE__) + '/spec'
@@ -50,6 +50,12 @@
     sh THRIFT, '--gen', 'rb:namespaced', '-recurse', '-o', dir, "#{dir}/ThriftNamespacedSpec.thrift"
   end
 
+  task :'flat_spec' do
+    dir = File.dirname(__FILE__) + '/spec'
+    mkdir_p("#{dir}/gen-rb/flat")
+    sh THRIFT, '--gen', 'rb', '-recurse', '-out', "#{dir}/gen-rb/flat", "#{dir}/ThriftNamespacedSpec.thrift"
+  end
+
   task :'benchmark' do
     dir = File.dirname(__FILE__) + '/benchmark'
     sh THRIFT, '--gen', 'rb', '-o', dir, "#{dir}/Benchmark.thrift"