diff --git a/Rakefile b/Rakefile
index 45d2107..21d713e 100644
--- a/Rakefile
+++ b/Rakefile
@@ -6,4 +6,5 @@ Rake::TestTask.new do |t|
   t.libs << "test"
   t.test_files = FileList["test/**/test_*.rb"]
   t.verbose = true
+  t.warning = true
 end