diff --git a/components/lib/treetable/treetable.d.ts b/components/lib/treetable/treetable.d.ts
index ed342b389b..54d9b878d8 100644
--- a/components/lib/treetable/treetable.d.ts
+++ b/components/lib/treetable/treetable.d.ts
@@ -514,7 +514,7 @@ interface TreeTableSelectionEvent {
     /**
      * Selected node key.
      */
-    value: TreeTableSelectionKeysType;
+    value: TreeTableSelectionKeysType | string;
 }
 
 /**