diff --git a/resque-heroku-signals.gemspec b/resque-heroku-signals.gemspec
index de561ce..2966163 100644
--- a/resque-heroku-signals.gemspec
+++ b/resque-heroku-signals.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  gem.metadata['rubygems_mfa_required'] = 'true'
+  spec.metadata['rubygems_mfa_required'] = 'true'
 
   # strict resque dependency is intentional
   spec.add_dependency "resque", "2.3.0"