--- a/doc/c-wrapper-ref.texi
+++ b/doc/c-wrapper-ref.texi
@@ -14,7 +14,7 @@
 @direntry
 * c-wrapper reference: (c-wrapper-refj.info).	A generic wrapper for C libraries.
 @end direntry
-@documentencoding euc-jp
+@documentencoding UTF-8
 @c COMMON
 @comment %**end of header
 
--- a/doc/extract
+++ b/doc/extract
@@ -138,8 +138,6 @@
         ((en) (filter #/^@c EN$/ #/^@c JP$/))
         ((jp) (filter #/^@c JP$/ #/^@c EN$/))))
 
-    (define outenc (if (eq? *lang* 'jp) 'euc-jp 'utf8))
-    
     (unless (= (length a) 1) (usage))
 
     (when (eq? *lang* 'jp)
@@ -148,9 +146,9 @@
     (with-input-from-file (car a)
       (lambda ()
         (if *outfile*
-          (with-output-to-file *outfile* do-it :encoding outenc)
+          (with-output-to-file *outfile* do-it :encoding 'utf8)
           (let1 out (open-output-conversion-port
-                     (current-output-port) outenc)
+                     (current-output-port) 'utf8)
             (with-output-to-port out do-it)
             (close-output-port out))))
       :encoding 'euc-jp)