diff --git a/app/components/post_textbox/post_textbox.js b/app/components/post_textbox/post_textbox.js
index f879880eb..af9c9783b 100644
--- a/app/components/post_textbox/post_textbox.js
+++ b/app/components/post_textbox/post_textbox.js
@@ -43,6 +43,8 @@ export default class PostTextbox extends PureComponent {
 
     static defaultProps = {
         rootId: '',
+        files: [],
+        value: '',
         onSelectionChange: () => true
     };