diff --git a/Casks/golly.rb b/Casks/golly.rb
index fda9ebc7e6e..98219c17cc5 100644
--- a/Casks/golly.rb
+++ b/Casks/golly.rb
@@ -18,7 +18,7 @@ cask :v1 => 'golly' do
   end
 
   homepage 'http://golly.sourceforge.net/'
-  license :oss
+  license :gpl
 
   caveats do
     files_in_usr_local