diff --git a/image/main.c b/image/main.c
index a8c746f5..bcc28f7d 100644
--- a/image/main.c
+++ b/image/main.c
@@ -93,6 +93,8 @@ struct metadump_struct {
 	pthread_cond_t cond;
 	struct rb_root name_tree;
 
+	struct extent_io_tree seen;
+
 	struct list_head list;
 	struct list_head ordered;
 	size_t num_items;
@@ -461,6 +463,7 @@ static void metadump_destroy(struct metadump_struct *md, int num_threads)
 		free(name->sub);
 		free(name);
 	}
+	extent_io_tree_cleanup(&md->seen);
 }
 
 static int metadump_init(struct metadump_struct *md, struct btrfs_root *root,
@@ -476,6 +479,7 @@ static int metadump_init(struct metadump_struct *md, struct btrfs_root *root,
 	memset(md, 0, sizeof(*md));
 	INIT_LIST_HEAD(&md->list);
 	INIT_LIST_HEAD(&md->ordered);
+	extent_io_tree_init(&md->seen);
 	md->root = root;
 	md->out = out;
 	md->pending_start = (u64)-1;
@@ -771,6 +775,14 @@ static int copy_tree_blocks(struct btrfs_root *root, struct extent_buffer *eb,
 	int i = 0;
 	int ret;
 
+	bytenr = btrfs_header_bytenr(eb);
+	if (test_range_bit(&metadump->seen, bytenr,
+			   bytenr + fs_info->nodesize - 1, EXTENT_DIRTY, 1))
+		return 0;
+
+	set_extent_dirty(&metadump->seen, bytenr,
+			 bytenr + fs_info->nodesize - 1);
+
 	ret = add_extent(btrfs_header_bytenr(eb), fs_info->nodesize,
 			 metadump, 0);
 	if (ret) {