diff --git a/magic_spoiler/__main__.py b/magic_spoiler/__main__.py
index b2c5882f..d6b74390 100644
--- a/magic_spoiler/__main__.py
+++ b/magic_spoiler/__main__.py
@@ -208,8 +208,7 @@ def open_header(card_xml_file: IO[Any]) -> None:
     :param card_xml_file: Card file path
     """
     card_xml_file.write(
-        "<?xml version='1.0' encoding='UTF-8'?>\n"
-        + "<cockatrice_carddatabase version='3'>\n"
+        "<cockatrice_carddatabase version='3'>\n"
         + "  <!--\n"
         + "  Created At: "
         + datetime.datetime.utcnow().strftime("%a, %b %d %Y, %H:%M:%S")
@@ -255,11 +254,11 @@ def close_xml_file(card_xml_file: IO[Any]) -> None:
     card_xml_file.write("</cards>\n</cockatrice_carddatabase>\n")
     card_xml_file.close()
 
-    # Make the files pretty
+    # Make the files pretty and add xml declaration
     parser = etree.XMLParser(remove_blank_text=True)
     root = etree.parse(card_xml_file.name, parser).getroot()
     with pathlib.Path(card_xml_file.name).open("wb") as f:
-        f.write(etree.tostring(root, pretty_print=True))
+        f.write(etree.tostring(root, encoding="UTF-8", xml_declaration=True, pretty_print=True))
 
 
 def xml_escape(text):