diff --git a/ChangeLog b/ChangeLog
index e6e41e9d15..3a7c47b756 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Aug 23 01:11:40 2005  Hirokazu Yamamoto  <ocean@m2.ccsnet.ne.jp>
+
+	* sprintf.c (ruby__sfvwrite): should move `buf' to the end of
+	  `result'. [ruby-dev:26859]
+
 Mon Aug 22 23:51:19 2005  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* parse.y: ONIG_OPTION_CAPTURE_GROUP conflicts with
diff --git a/sprintf.c b/sprintf.c
index 254b080d90..129c4b78a9 100644
--- a/sprintf.c
+++ b/sprintf.c
@@ -868,6 +868,7 @@ ruby__sfvwrite(fp, uio)
     if ((len = uio->uio_resid) == 0)
 	return 0;
     CHECK(len);
+    buf += blen;
     fp->_w = bsiz;
     for (iov = uio->uio_iov; len > 0; ++iov) {
 	MEMCPY(buf, iov->iov_base, char, n = iov->iov_len);