diff --git a/iolog.h b/iolog.h
index 6503acf..321576d 100644
--- a/iolog.h
+++ b/iolog.h
@@ -83,6 +83,7 @@
 		struct fio_file *file;
 	};
 	unsigned long long offset;
+	unsigned short numberio;
 	unsigned long len;
 	unsigned int flags;
 	enum fio_ddir ddir;