diff --git a/app/services/fetch_link_card_service.rb b/app/services/fetch_link_card_service.rb
index 7029c4d75..14c21b6cc 100644
--- a/app/services/fetch_link_card_service.rb
+++ b/app/services/fetch_link_card_service.rb
@@ -3,7 +3,7 @@
 class FetchLinkCardService < BaseService
   URL_PATTERN = %r{
     (                                                                                                 #   $1 URL
-      (https?:\/\/)?                                                                                  #   $2 Protocol (optional)
+      (https?:\/\/)                                                                                   #   $2 Protocol (required)
       (#{Twitter::Regex[:valid_domain]})                                                              #   $3 Domain(s)
       (?::(#{Twitter::Regex[:valid_port_number]}))?                                                   #   $4 Port number (optional)
       (/#{Twitter::Regex[:valid_url_path]}*)?                                                         #   $5 URL Path and anchor