diff --git a/factory_girl.gemspec b/factory_girl.gemspec
index 446dc74..b500dbb 100644
--- a/factory_girl.gemspec
+++ b/factory_girl.gemspec
@@ -40,5 +40,6 @@ Gem::Specification.new do |s|
   end
 
   s.add_development_dependency("yard")
+  s.license = "MIT"
 end