diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 6b0fc16..6cfa8d4 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -562,6 +562,8 @@
 	region_t nr_regions;
 	int in_sync;
 
+	struct mirror *default_mirror;	/* Default mirror */
+
 	unsigned int nr_mirrors;
 	struct mirror mirror[0];
 };
@@ -611,7 +613,7 @@
 	unsigned long flags = 0;
 
 	/* fill in the source */
-	m = ms->mirror + DEFAULT_MIRROR;
+	m = ms->default_mirror;
 	from.bdev = m->dev->bdev;
 	from.sector = m->offset + region_to_sector(reg->rh, reg->key);
 	if (reg->key == (ms->nr_regions - 1)) {
@@ -627,7 +629,7 @@
 
 	/* fill in the destinations */
 	for (i = 0, dest = to; i < ms->nr_mirrors; i++) {
-		if (i == DEFAULT_MIRROR)
+		if (&ms->mirror[i] == ms->default_mirror)
 			continue;
 
 		m = ms->mirror + i;
@@ -682,7 +684,7 @@
 static struct mirror *choose_mirror(struct mirror_set *ms, sector_t sector)
 {
 	/* FIXME: add read balancing */
-	return ms->mirror + DEFAULT_MIRROR;
+	return ms->default_mirror;
 }
 
 /*
@@ -709,7 +711,7 @@
 		if (rh_in_sync(&ms->rh, region, 0))
 			m = choose_mirror(ms, bio->bi_sector);
 		else
-			m = ms->mirror + DEFAULT_MIRROR;
+			m = ms->default_mirror;
 
 		map_bio(ms, m, bio);
 		generic_make_request(bio);
@@ -833,7 +835,7 @@
 		rh_delay(&ms->rh, bio);
 
 	while ((bio = bio_list_pop(&nosync))) {
-		map_bio(ms, ms->mirror + DEFAULT_MIRROR, bio);
+		map_bio(ms, ms->default_mirror, bio);
 		generic_make_request(bio);
 	}
 }
@@ -900,6 +902,7 @@
 	ms->nr_mirrors = nr_mirrors;
 	ms->nr_regions = dm_sector_div_up(ti->len, region_size);
 	ms->in_sync = 0;
+	ms->default_mirror = &ms->mirror[DEFAULT_MIRROR];
 
 	if (rh_init(&ms->rh, ms, dl, region_size, ms->nr_regions)) {
 		ti->error = "dm-mirror: Error creating dirty region hash";