diff --git a/[refs] b/[refs]
index ee066cedcb30..a0e9593bc1ef 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 650d2a06b4fe1cc1d218c20e256650f68bf0ca31
+refs/heads/master: 7c8d3a42fe1c58a7e8fd3f6a013e7d7b474ff931
diff --git a/trunk/drivers/md/dm-raid1.c b/trunk/drivers/md/dm-raid1.c
index ea16984c0f08..b58b7a33914a 100644
--- a/trunk/drivers/md/dm-raid1.c
+++ b/trunk/drivers/md/dm-raid1.c
@@ -1084,6 +1084,7 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 	ti->split_io = dm_rh_get_region_size(ms->rh);
 	ti->num_flush_requests = 1;
 	ti->num_discard_requests = 1;
+	ti->discard_zeroes_data_unsupported = 1;
 
 	ms->kmirrord_wq = alloc_workqueue("kmirrord",
 					  WQ_NON_REENTRANT | WQ_MEM_RECLAIM, 0);