diff --git a/packages/table-core/src/types.ts b/packages/table-core/src/types.ts
index 26bf47939e..e7fa3ca0b4 100644
--- a/packages/table-core/src/types.ts
+++ b/packages/table-core/src/types.ts
@@ -283,7 +283,7 @@ export type DisplayColumnDef<
   TValue = unknown,
 > = ColumnDefBase<TData, TValue> & ColumnIdentifiers<TData, TValue>
 
-interface GroupColumnDefBase<TData extends RowData, TValue = unknown>
+export interface GroupColumnDefBase<TData extends RowData, TValue = unknown>
   extends ColumnDefBase<TData, TValue> {
   columns?: ColumnDef<TData, any>[]
 }