diff --git a/magic_spoiler/__main__.py b/magic_spoiler/__main__.py
index 76f4e022..d0618fcd 100644
--- a/magic_spoiler/__main__.py
+++ b/magic_spoiler/__main__.py
@@ -208,7 +208,7 @@ def open_header(card_xml_file: IO[Any]) -> None:
     :param card_xml_file: Card file path
     """
     card_xml_file.write(
-        "<!--\n"
+        "\<!--\n"
         + "THIS FILE IS AUTOMATICALLY GENERATED ON A REGULAR BASIS. ALL MANUAL EDITS WILL BE OVERRIDDEN.\n"
         + "-->\n"
         * "<cockatrice_carddatabase version='4' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='https://raw.githubusercontent.com/Cockatrice/Cockatrice/master/doc/carddatabase_v4/cards.xsd'>\n"