diff --git a/lib/rb/Rakefile b/lib/rb/Rakefile
index 6ddca52..b5aa2ad 100644
--- a/lib/rb/Rakefile
+++ b/lib/rb/Rakefile
@@ -4,7 +4,7 @@
 
 THRIFT = '../../compiler/cpp/thrift'
 
-task :default => [:spec, :test]
+task :default => [:'gen-rb', :spec, :test]
 
 Spec::Rake::SpecTask.new do |t|
   t.spec_files = FileList['spec/**/*_spec.rb']