diff --git a/types/js-cookie/index.d.ts b/types/js-cookie/index.d.ts
index 7b90b4ecd5..71fd7c793d 100644
--- a/types/js-cookie/index.d.ts
+++ b/types/js-cookie/index.d.ts
@@ -3,6 +3,7 @@
 // Definitions by: Theodore Brown <https://github.com/theodorejb>
 //                 BendingBender <https://github.com/BendingBender>
 //                 Antoine Lépée <https://github.com/alepee>
+//                 Yuto Doi <https://github.com/yutod>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -88,7 +89,7 @@ declare namespace Cookies {
          * will run the converter first for each cookie. The returned
          * string will be used as the cookie value.
          */
-        withConverter<TConv extends object>(converter: CookieReadConverter | { write: CookieWriteConverter<TConv>; read: CookieReadConverter; }): CookiesStatic<TConv>;
+        withConverter<TConv extends object>(converter: CookieReadConverter | { write?: CookieWriteConverter<TConv>; read?: CookieReadConverter; }): CookiesStatic<TConv>;
     }
 
     type CookieWriteConverter<T extends object> = (value: string | T, name: string) => string;
diff --git a/types/js-cookie/js-cookie-tests.ts b/types/js-cookie/js-cookie-tests.ts
index df30d90975..5e263ca266 100644
--- a/types/js-cookie/js-cookie-tests.ts
+++ b/types/js-cookie/js-cookie-tests.ts
@@ -53,3 +53,15 @@ const PHPCookies = Cookies.withConverter<object>({
             .replace(/(%[0-9A-Z]{2})+/g, decodeURIComponent);
     }
 });
+
+const BlankConverterCookies = Cookies.withConverter({
+    read(value, name) {
+        if (name === 'hoge') {
+            return value.replace('hoge', 'fuga');
+        }
+        return value;
+    }
+});
+
+document.cookie = 'hoge=hogehoge';
+BlankConverterCookies.get('hoge');