diff --git a/Rakefile b/Rakefile
index 094820349e1425bfe70e125f2d338b99397f0fec..220a4da38f35e61d1dd4c78e294489287d65cdbe 100644
--- a/Rakefile
+++ b/Rakefile
@@ -9,6 +9,7 @@ Rake::TestTask.new(:test) do |test|
   test.libs << 'lib' << 'test'
   test.pattern = 'test/**/*_test.rb'
   test.verbose = true
+  test.warning = true
 end
 
 begin