diff --git a/mailbox/parser.py b/mailbox/parser.py
index 49c15ae..be7d00f 100644
--- a/mailbox/parser.py
+++ b/mailbox/parser.py
@@ -1,5 +1,4 @@
 import email
-from email.header import decode_header
 
 def decode_mail_header(value, default_charset='us-ascii'):
 	"""