diff --git a/app/views/posts/_form.haml b/app/views/posts/_form.haml
index 99da1da..8c99ab8 100644
--- a/app/views/posts/_form.haml
+++ b/app/views/posts/_form.haml
@@ -22,7 +22,7 @@
   - if current_user.is_a? Usuaria
     .form-group
       = label_tag 'post_author', t('posts.author')
-      - todxs = (@site.usuarias + @site.invitadxs).map(&:username)
+      - todxs = (@site.usuarias + @site.invitadxs).compact.uniq.map(&:username)
       = select_tag 'post[author]',
         options_for_select(todxs, @post.author || current_user.email),
         { class: 'form-control select2',