diff --git a/components/vc-calendar/src/Picker.jsx b/components/vc-calendar/src/Picker.jsx
index 1387e8a36..51b286f36 100644
--- a/components/vc-calendar/src/Picker.jsx
+++ b/components/vc-calendar/src/Picker.jsx
@@ -41,6 +41,7 @@ const Picker = {
       PropTypes.arrayOf(MomentType),
     ]),
     align: PropTypes.object.def({}),
+    dropdownClassName: PropTypes.string,
   },
   mixins: [BaseMixin],