diff --git a/Casks/j.rb b/Casks/j.rb
index 7f3bdfdaa..4b4f86c02 100644
--- a/Casks/j.rb
+++ b/Casks/j.rb
@@ -4,7 +4,7 @@ cask :v1 => 'j' do
 
   url "http://www.jsoftware.com/download/j#{version}/install/j#{version}_mac64.zip"
   homepage 'http://www.jsoftware.com'
-  license :unknown    # todo: improve this machine-generated value
+  license :gpl
 
   %w<jbrk jcon jhs jqt>.each do |a|
     app "j64-#{version}/#{a}.app"