diff --git a/src/log.c b/src/log.c
index 03d350564..3172ca861 100644
--- a/src/log.c
+++ b/src/log.c
@@ -4629,14 +4629,14 @@ int sess_build_logline_orig(struct session *sess, struct stream *s,
 			case LOG_FMT_BYTES: // %B
 				if (!(fe->to_log & LW_BYTES))
 					LOGMETACHAR('+');
-				ret = lf_int(tmplog, dst + maxsize - tmplog, logs->req_in, ctx, LF_INT_LLTOA);
+				ret = lf_int(tmplog, dst + maxsize - tmplog, logs->res_in, ctx, LF_INT_LLTOA);
 				if (ret == NULL)
 					goto out;
 				tmplog = ret;
 				break;
 
 			case LOG_FMT_BYTES_UP: // %U
-				ret = lf_int(tmplog, dst + maxsize - tmplog, logs->res_out, ctx, LF_INT_LLTOA);
+				ret = lf_int(tmplog, dst + maxsize - tmplog, logs->req_in, ctx, LF_INT_LLTOA);
 				if (ret == NULL)
 					goto out;
 				tmplog = ret;