diff --git a/src/calendar_icon.jsx b/src/calendar_icon.jsx
index 01f21dd0e..20961ce27 100644
--- a/src/calendar_icon.jsx
+++ b/src/calendar_icon.jsx
@@ -1,7 +1,7 @@
 import React from "react";
 import PropTypes from "prop-types";
 
-const CalendarIcon = ({ icon, className }) => {
+const CalendarIcon = ({ icon, className = "" }) => {
   const defaultClass = "react-datepicker__calendar-icon";
 
   if (React.isValidElement(icon)) {
@@ -36,8 +36,4 @@ CalendarIcon.propTypes = {
   className: PropTypes.string,
 };
 
-CalendarIcon.defaultProps = {
-  className: "",
-};
-
 export default CalendarIcon;