diff --git a/src/stdio/__toread.c b/src/stdio/__toread.c
index b08f5bb4..35f67b8f 100644
--- a/src/stdio/__toread.c
+++ b/src/stdio/__toread.c
@@ -3,7 +3,7 @@
 int __toread(FILE *f)
 {
 	f->mode |= f->mode-1;
-	if (f->wpos > f->buf) f->write(f, 0, 0);
+	if (f->wpos > f->wbase) f->write(f, 0, 0);
 	f->wpos = f->wbase = f->wend = 0;
 	if (f->flags & F_NORD) {
 		f->flags |= F_ERR;