diff --git a/app/helpers/crops_helper.rb b/app/helpers/crops_helper.rb
index 9a55ea8d1..725e512bb 100644
--- a/app/helpers/crops_helper.rb
+++ b/app/helpers/crops_helper.rb
@@ -58,7 +58,7 @@ module CropsHelper
         subject_of_entities << {
           '@type': "SocialMediaPosting",
           url:     post_url(post),
-          author:  post.author
+          author:  post.author.login_name
         }
       end