diff --git a/danmaku2ass.py b/danmaku2ass.py
index 0cb725d..1a14395 100755
--- a/danmaku2ass.py
+++ b/danmaku2ass.py
@@ -528,7 +528,7 @@ def MarkCommentRow(rows, c, row):
 
 def WriteASSHead(f, width, height, fontface, fontsize, alpha, styleid):
     f.write(
-'''\ufeff
+'''
 [Script Info]
 ; Script generated by Danmaku2ASS
 ; https://github.com/m13253/danmaku2ass
@@ -625,7 +625,7 @@ def Danmaku2ASS(input_files, output_file, stage_width, stage_height, reserve_bla
     comments = ReadComments(input_files, font_size)
     try:
         if output_file:
-            fo = ConvertToFile(output_file, 'w', encoding='utf-8', newline='\r\n')
+            fo = ConvertToFile(output_file, 'w', encoding='utf-8-sig', newline='\r\n')
         else:
             fo = sys.stdout
         ProcessComments(comments, fo, stage_width, stage_height, reserve_blank, font_face, font_size, text_opaque, comment_duration, is_reduce_comments, progress_callback)