diff --git a/build/tasks/check-licenses-task.coffee b/build/tasks/check-licenses-task.coffee
index 27cef1709..685624abd 100644
--- a/build/tasks/check-licenses-task.coffee
+++ b/build/tasks/check-licenses-task.coffee
@@ -15,6 +15,12 @@ module.exports = (grunt) ->
         console.error(err)
         exit 1
 
+      # Omit failure for coffee-script bundle for now. It seems to be intended
+      # to be open source but has no license.
+      for dependencyName in keys(summary)
+        if dependencyName.match /^language-coffee-script@/
+          delete summary[dependencyName]
+
       if size(summary)
         console.error "Found dependencies without permissive licenses:"
         for name in keys(summary).sort()