diff --git a/WHATS_NEW b/WHATS_NEW
index 740c5dc82..74ae927f9 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.92 - 
 ====================================
+  Make conversion from a synced 'mirror' to 'raid1' not cause a full resync.
   Properly test buffer for unit check in units_to_bytes().
   Add configure --with-systemdsystemunitdir.
   Add check for allocation failure in _build_matcher().
diff --git a/lib/raid/raid.c b/lib/raid/raid.c
index 3656dada8..211f80706 100644
--- a/lib/raid/raid.c
+++ b/lib/raid/raid.c
@@ -159,6 +159,7 @@ static int _raid_add_target_line(struct dev_manager *dm __attribute__((unused)),
 				 uint32_t *pvmove_mirror_count __attribute__((unused)))
 {
 	uint32_t s;
+	uint64_t flags = 0;
 	uint64_t rebuilds = 0;
 
 	if (!seg->area_count) {
@@ -186,9 +187,12 @@ static int _raid_add_target_line(struct dev_manager *dm __attribute__((unused)),
 		if (seg_lv(seg, s)->status & LV_REBUILD)
 			rebuilds |= 1 << s;
 
+	if (mirror_in_sync())
+		flags = DM_NOSYNC;
+
 	if (!dm_tree_node_add_raid_target(node, len, _raid_name(seg),
 					  seg->region_size, seg->stripe_size,
-					  rebuilds, 0))
+					  rebuilds, flags))
 		return_0;
 
 	return add_areas_line(dm, seg, node, 0u, seg->area_count);
diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index 4ebee2fb5..61a4374f7 100644
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -548,7 +548,7 @@ int dm_tree_node_add_raid_target(struct dm_tree_node *node,
 				 uint32_t region_size,
 				 uint32_t stripe_size,
 				 uint64_t rebuilds,
-				 uint64_t reserved2);
+				 uint64_t flags);
 
 /*
  * Replicator operation mode
diff --git a/libdm/libdm-deptree.c b/libdm/libdm-deptree.c
index dabd72253..061331630 100644
--- a/libdm/libdm-deptree.c
+++ b/libdm/libdm-deptree.c
@@ -2751,7 +2751,7 @@ int dm_tree_node_add_raid_target(struct dm_tree_node *node,
 				 uint32_t region_size,
 				 uint32_t stripe_size,
 				 uint64_t rebuilds,
-				 uint64_t reserved2)
+				 uint64_t flags)
 {
 	int i;
 	struct load_segment *seg = NULL;
@@ -2769,6 +2769,7 @@ int dm_tree_node_add_raid_target(struct dm_tree_node *node,
 	seg->stripe_size = stripe_size;
 	seg->area_count = 0;
 	seg->rebuilds = rebuilds;
+	seg->flags = flags;
 
 	return 1;
 }