diff --git a/lisp/gnus/ChangeLog b/lisp/gnus/ChangeLog
index 68d671d58f714360d14991ed383cf4aecd4f9cfd..4acb6a8a621c5fb2ef3d200cb62841122f07d05b 100644
--- a/lisp/gnus/ChangeLog
+++ b/lisp/gnus/ChangeLog
@@ -1,3 +1,8 @@
+2010-09-02  Katsumi Yamaoka  <yamaoka@jpl.org>
+
+	* gnus-html.el (gnus-article-html): Make work buffer multibyte for
+	decoded contents.
+
 2010-09-02  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
 	* gnus-group.el (gnus-group-line-format): Remove %O (moderated) from
diff --git a/lisp/gnus/gnus-html.el b/lisp/gnus/gnus-html.el
index 7e13a0bde979c043dfe8f8eff1cb8b2e9adc5da7..80eaae680520948497dd009dfc053da9f803f034 100644
--- a/lisp/gnus/gnus-html.el
+++ b/lisp/gnus/gnus-html.el
@@ -82,7 +82,10 @@ fit these criteria."
 	    (when (and charset
 		       (setq charset (mm-charset-to-coding-system charset))
 		       (not (eq charset 'ascii)))
-	      (mm-decode-coding-region (point-min) (point-max) charset))
+	      (insert (prog1
+			  (mm-decode-coding-string (buffer-string) charset)
+			(erase-buffer)
+			(mm-enable-multibyte))))
 	    (call-process-region (point-min) (point-max)
 				 "w3m"
 				 nil article-buffer nil