diff --git a/src/Calendar.tsx b/src/Calendar.tsx
index 39db6719..9bb37899 100644
--- a/src/Calendar.tsx
+++ b/src/Calendar.tsx
@@ -1,3 +1,5 @@
+'use client';
+
 import React, { forwardRef, useCallback, useImperativeHandle, useState } from 'react';
 import PropTypes from 'prop-types';
 import clsx from 'clsx';
diff --git a/src/Calendar/Navigation.tsx b/src/Calendar/Navigation.tsx
index e57807fd..00493530 100644
--- a/src/Calendar/Navigation.tsx
+++ b/src/Calendar/Navigation.tsx
@@ -1,3 +1,5 @@
+'use client';
+
 import React from 'react';
 import PropTypes from 'prop-types';
 import { getUserLocale } from 'get-user-locale';