diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 546458246cf9..6b262ccb6b32 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -2557,6 +2557,7 @@ static void calc_vtime_cost_builtin(struct bio *bio, struct ioc_gq *iocg,
 		coef_randio	= ioc->params.lcoefs[LCOEF_RRANDIO];
 		coef_page	= ioc->params.lcoefs[LCOEF_RPAGE];
 		break;
+	case REQ_OP_ZONE_APPEND:
 	case REQ_OP_WRITE:
 		coef_seqio	= ioc->params.lcoefs[LCOEF_WSEQIO];
 		coef_randio	= ioc->params.lcoefs[LCOEF_WRANDIO];