diff --git a/iolog.c b/iolog.c
index 6593367..ec29971 100644
--- a/iolog.c
+++ b/iolog.c
@@ -188,6 +188,7 @@
 	ipo->file = io_u->file;
 	ipo->offset = io_u->offset;
 	ipo->len = io_u->buflen;
+	ipo->numberio = io_u->numberio;
 
 	if (io_u_should_trim(td, io_u)) {
 		flist_add_tail(&ipo->trim_list, &td->trim_list);