diff --git a/Rakefile b/Rakefile
index 5b1cf0ed..67e61923 100644
--- a/Rakefile
+++ b/Rakefile
@@ -11,6 +11,7 @@ Rake::TestTask.new do |t|
   t.libs << "test"
   t.test_files = FileList['test/test_*.rb']
   t.verbose = true
+  t.warning = true
 end
 
 YARD::Rake::YardocTask.new