diff --git a/ChangeLog b/ChangeLog
index 346dd8187b..d64bbb7bf5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -48,11 +48,6 @@ Wed Aug 12 11:51:51 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* configure.in (rb_cv_broken_crypt): needs more checks.
 
-Wed Aug 12 08:39:15 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* sprintf.c (rb_str_format): should preserve format encoding
-	  before raising CompatibilityError.  [ruby-list:46274]
-
 Wed Aug 12 07:41:31 2009  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* encoding.c (rb_enc_compatible): If a string is empty and
diff --git a/sprintf.c b/sprintf.c
index 4a37ecb8b8..11f97e5321 100644
--- a/sprintf.c
+++ b/sprintf.c
@@ -677,7 +677,7 @@ rb_str_format(int argc, const VALUE *argv, VALUE fmt)
 				      (cr == ENC_CODERANGE_UNKNOWN ?
 				       ENC_CODERANGE_BROKEN : (coderange = cr)));
 		}
-		enc = rb_enc_check((RSTRING_LEN(result) == 0 ? fmt : result), str);
+		enc = rb_enc_check(result, str);
 		if (flags&(FPREC|FWIDTH)) {
 		    slen = rb_enc_strlen(RSTRING_PTR(str),RSTRING_END(str),enc);
 		    if (slen < 0) {