diff --git a/src/table/type.ts b/src/table/type.ts
index 363c9223c2..055bda1b2e 100644
--- a/src/table/type.ts
+++ b/src/table/type.ts
@@ -963,7 +963,7 @@ export type TableRowAttributes<T> =
 export interface RowClassNameParams<T> {
   row: T;
   rowIndex: number;
-  rowKey: string;
+  rowKey?: string;
   type?: 'body' | 'foot';
 }