diff --git a/ts/index.ts b/ts/index.ts
index 0ea0765..77a4904 100644
--- a/ts/index.ts
+++ b/ts/index.ts
@@ -2,7 +2,7 @@ import * as plugins from './smartcsv.plugins';
 
 export interface ICsvConstructorOptions {
   headers: boolean;
-  unquote: boolean;
+  unquote?: boolean;
 }
 
 export class Csv {