diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 8da6282254c3e822a27702c469b9afce720bda43..b3d79db35e9b143e0bea303592830c0a4240d752 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -717,7 +717,7 @@ static struct md_rdev *read_balance(struct r10conf *conf,
 	int sectors = r10_bio->sectors;
 	int best_good_sectors;
 	sector_t new_distance, best_dist;
-	struct md_rdev *rdev, *best_rdev;
+	struct md_rdev *best_rdev, *rdev = NULL;
 	int do_balance;
 	int best_slot;
 	struct geom *geo = &conf->geo;