diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 3fa7d2bb1cd..3230ff1b004 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -78,7 +78,7 @@ module ApplicationHelper
     if user
       user.avatar_url(size) || default_avatar
     else
-      gravatar_icon(user_or_email, size, scales)
+      gravatar_icon(user_or_email, size, scale)
     end
   end