diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 2b8abc499b18..c3945d470779 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -906,8 +906,10 @@ static bool ioc_refresh_params(struct ioc *ioc, bool force)
 	if (idx == ioc->autop_idx && !force)
 		return false;
 
-	if (idx != ioc->autop_idx)
+	if (idx != ioc->autop_idx) {
 		atomic64_set(&ioc->vtime_rate, VTIME_PER_USEC);
+		ioc->vtime_base_rate = VTIME_PER_USEC;
+	}
 
 	ioc->autop_idx = idx;
 	ioc->autop_too_fast_at = 0;