diff --git a/iiod/responder.c b/iiod/responder.c
index 3b9c2bca3..caddb927d 100644
--- a/iiod/responder.c
+++ b/iiod/responder.c
@@ -750,7 +750,7 @@ static void handle_transfer_block(struct parser_pdata *pdata,
 	int ret;
 
 	buf = get_iio_buffer(pdata, cmd, &entry);
-	ret = iio_err(block);
+	ret = iio_err(buf);
 	if (ret)
 		goto out_send_response;