diff --git a/Casks/crashlytics.rb b/Casks/crashlytics.rb
index 72eeb0c40..10581e57e 100644
--- a/Casks/crashlytics.rb
+++ b/Casks/crashlytics.rb
@@ -5,6 +5,7 @@ class Crashlytics < Cask
   url 'https://crashlytics.com/download/mac'
   appcast 'https://ssl-download-crashlytics-com.s3.amazonaws.com/mac/version.xml'
   homepage 'http://crashlytics.com'
+  license :unknown
 
   app 'Crashlytics.app'
 end