diff --git a/packages/tree/src/model/node.js b/packages/tree/src/model/node.js
index ee1eccfa4..36afeaf74 100644
--- a/packages/tree/src/model/node.js
+++ b/packages/tree/src/model/node.js
@@ -112,7 +112,7 @@ export default class Node {
       this.expand();
     }
     if (!Array.isArray(this.data)) {
-        markNodeData(this, this.data);
+      markNodeData(this, this.data);
     }
     if (!this.data) return;
     const defaultExpandedKeys = store.defaultExpandedKeys;