diff --git a/src/components/Popup/index.js b/src/components/Popup/index.js
index 8f785b91..d6a19f56 100644
--- a/src/components/Popup/index.js
+++ b/src/components/Popup/index.js
@@ -70,10 +70,10 @@ class Popup extends PureComponent<Props> {
   static defaultProps = {
     closeButton: true,
     closeOnClick: true,
-    onClose: null,
-    anchor: null,
-    offset: null,
-    className: null,
+    onClose: undefined,
+    anchor: undefined,
+    offset: undefined,
+    className: undefined,
     maxWidth: '240px'
   };