diff --git a/ChangeLog b/ChangeLog
index 7e742de8b2..7b05ac1cce 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,10 +1,7 @@
 Mon Nov 29 01:18:18 2004  Tanaka Akira  <akr@m17n.org>
 
-	* io.c (rb_io_check_writable): restrict io_seek by
-	  READ_DATA_PENDING because io_seek(fptr, 0, SEEK_CUR) is
-	  meaningful only if read buffer is not empty.
-	  call io_seek regardless of NEED_IO_SEEK_BETWEEN_RW.
-	  [ruby-dev:24986]
+	* io.c (rb_io_check_writable): call io_seek regardless of
+	  NEED_IO_SEEK_BETWEEN_RW.  [ruby-dev:24986]
 
 Sun Nov 28 15:57:58 2004  Kouhei Sutou  <kou@cozmixng.org>
 
diff --git a/io.c b/io.c
index 8bc6d9b74d..649f272906 100644
--- a/io.c
+++ b/io.c
@@ -261,8 +261,7 @@ rb_io_check_writable(fptr)
     if (!(fptr->mode & FMODE_WRITABLE)) {
 	rb_raise(rb_eIOError, "not opened for writing");
     }
-    if ((fptr->mode & FMODE_RBUF) && !feof(fptr->f) && !fptr->f2 &&
-        READ_DATA_PENDING(fptr->f)) {
+    if ((fptr->mode & FMODE_RBUF) && !feof(fptr->f) && !fptr->f2) {
 	io_seek(fptr, 0, SEEK_CUR);
     }
     if (!fptr->f2) {