diff --git a/Casks/elm-platform.rb b/Casks/elm-platform.rb
index 261b41adc2c..1a44c96937a 100644
--- a/Casks/elm-platform.rb
+++ b/Casks/elm-platform.rb
@@ -4,6 +4,7 @@ class ElmPlatform < Cask
 
   url "http://install.elm-lang.org/Elm-Platform-#{version}.pkg"
   homepage 'http://www.elm-lang.org'
+  license :unknown
 
   pkg "Elm-Platform-#{version}.pkg"
   uninstall :pkgutil => 'org.elm-lang.*',