diff --git a/mkfs/common.c b/mkfs/common.c
index 16916ca2..6924d9b7 100644
--- a/mkfs/common.c
+++ b/mkfs/common.c
@@ -44,6 +44,7 @@ static int btrfs_create_tree_root(int fd, struct btrfs_mkfs_config *cfg,
 	u32 itemoff;
 	int ret = 0;
 	int blk;
+	u8 uuid[BTRFS_UUID_SIZE];
 
 	memset(buf->data + sizeof(struct btrfs_header), 0,
 		cfg->nodesize - sizeof(struct btrfs_header));
@@ -77,6 +78,19 @@ static int btrfs_create_tree_root(int fd, struct btrfs_mkfs_config *cfg,
 		btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
 		btrfs_set_item_size(buf, btrfs_item_nr(nritems),
 				sizeof(root_item));
+		if (blk == MKFS_FS_TREE) {
+			time_t now = time(NULL);
+
+			uuid_generate(uuid);
+			memcpy(root_item.uuid, uuid, BTRFS_UUID_SIZE);
+			btrfs_set_stack_timespec_sec(&root_item.otime, now);
+			btrfs_set_stack_timespec_sec(&root_item.ctime, now);
+		} else {
+			memset(uuid, 0, BTRFS_UUID_SIZE);
+			memcpy(root_item.uuid, uuid, BTRFS_UUID_SIZE);
+			btrfs_set_stack_timespec_sec(&root_item.otime, 0);
+			btrfs_set_stack_timespec_sec(&root_item.ctime, 0);
+		}
 		write_extent_buffer(buf, &root_item,
 			btrfs_item_ptr_offset(buf, nritems),
 			sizeof(root_item));
diff --git a/mkfs/main.c b/mkfs/main.c
index 5a717f70..40efa26b 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -315,6 +315,7 @@ static int create_tree(struct btrfs_trans_handle *trans,
 	struct btrfs_key location;
 	struct btrfs_root_item root_item;
 	struct extent_buffer *tmp;
+	u8 uuid[BTRFS_UUID_SIZE] = {0};
 	int ret;
 
 	ret = btrfs_copy_root(trans, root, root->node, &tmp, objectid);
@@ -325,6 +326,10 @@ static int create_tree(struct btrfs_trans_handle *trans,
 	btrfs_set_root_bytenr(&root_item, tmp->start);
 	btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
 	btrfs_set_root_generation(&root_item, trans->transid);
+	/* clear uuid and o/ctime of source tree */
+	memcpy(root_item.uuid, uuid, BTRFS_UUID_SIZE);
+	btrfs_set_stack_timespec_sec(&root_item.otime, 0);
+	btrfs_set_stack_timespec_sec(&root_item.ctime, 0);
 	free_extent_buffer(tmp);
 
 	location.objectid = objectid;