1 files changed, 0 insertions, 3 deletions
diff --git a/io.c b/io.c
index 45056040bb..2c71a6d929 100644
--- a/io.c
+++ b/io.c
@@ -254,9 +254,6 @@ rb_io_check_writable(fptr)
     if (!(fptr->mode & FMODE_WRITABLE)) {
 	rb_raise(rb_eIOError, "not opened for writing");
     }
-    if ((fptr->mode & FMODE_RBUF) && READ_DATA_BUFFERED(fptr->f)) {
-	rb_warn("read buffer data lost");
-    }
 #if NEED_IO_SEEK_BETWEEN_RW
     if ((fptr->mode & FMODE_RBUF) && !feof(fptr->f) && !fptr->f2) {
 	io_seek(fptr, 0, SEEK_CUR);