diff --git a/src/components/Tree/src/types/tree.ts b/src/components/Tree/src/types/tree.ts
index 604adb3e68a..c879233e310 100644
--- a/src/components/Tree/src/types/tree.ts
+++ b/src/components/Tree/src/types/tree.ts
@@ -91,6 +91,7 @@ export const treeProps = buildProps({
 
   expandedKeys: {
     type: Array as PropType<KeyType[]>,
+    default: () => [],
   },
 
   selectedKeys: {