diff --git a/tasks/vox.rake b/tasks/vox.rake
index 92938eb820..2dbbb01819 100644
--- a/tasks/vox.rake
+++ b/tasks/vox.rake
@@ -10,7 +10,7 @@ namespace :vox do
 
     data = File.read('lib/puppet/version.rb')
     new_data = data.sub(/PUPPETVERSION = '\d+\.\d+\.\d+(\.rc\d+)?'/, "PUPPETVERSION = '#{version}'")
-    warn 'Failed to update version in lib/puppet/version.rb' if data == new_data
+    fail 'Failed to update version in lib/puppet/version.rb' if data == new_data
 
     File.write('lib/puppet/version.rb', new_data)
   end