diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 3e7b1548111a95d58b690fd68090d3b34751e8b5..3f91c2e1dfe765e79b916e18b74f22f23da14e04 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3189,7 +3189,7 @@ static void calc_sectors(struct r10conf *conf, sector_t size)
 	if (conf->far_offset)
 		conf->stride = 1 << conf->chunk_shift;
 	else {
-		sector_div(size, conf->near_copies);
+		sector_div(size, conf->far_copies);
 		conf->stride = size << conf->chunk_shift;
 	}
 }