diff --git a/disk-io.c b/disk-io.c
index e4550bd4..e840177f 100644
--- a/disk-io.c
+++ b/disk-io.c
@@ -683,6 +683,7 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 	struct btrfs_root *root;
 	struct rb_node *node;
 	int ret;
+	u64 objectid = location->objectid;
 
 	if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
 		return fs_info->tree_root;
@@ -698,7 +699,7 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 	BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 	       location->offset != (u64)-1);
 
-	node = rb_search(&fs_info->fs_root_tree, (void *)&location->objectid,
+	node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
 			 btrfs_fs_roots_compare_objectids, NULL);
 	if (node)
 		return container_of(node, struct btrfs_root, rb_node);