--- rfc2047.el	7 Apr 2004 19:41:45 -0000	7.11
+++ rfc2047.el	7 May 2004 09:07:53 -0000
@@ -406,7 +406,7 @@
 			   'Q))))
 	 (start (concat
 		 "=?" (downcase (symbol-name mime-charset)) "?"
-		 (downcase (symbol-name encoding)) "?"))
+		 (upcase (symbol-name encoding)) "?"))
 	 (factor (case mime-charset
 		   ((iso-8859-5 iso-8859-7 iso-8859-8 koi8-r) 1)
 		   ((big5 gb2312 euc-kr) 2)