diff --git a/redistat.gemspec b/redistat.gemspec
index fb0ee41..dcc62a5 100644
--- a/redistat.gemspec
+++ b/redistat.gemspec
@@ -27,4 +27,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rspec', '>= 2.1.0'
   s.add_development_dependency 'rcov', '>= 0.9.9'
   s.add_development_dependency 'yard', '>= 0.6.3'
+  s.add_development_dependency 'ruby-debug'
 end