diff --git a/src/components/views/messages/SenderProfile.js b/src/components/views/messages/SenderProfile.js
index b0c35e41d5..807081bcd2 100644
--- a/src/components/views/messages/SenderProfile.js
+++ b/src/components/views/messages/SenderProfile.js
@@ -23,7 +23,7 @@ module.exports = React.createClass({
 
     propTypes: {
         mxEvent: React.PropTypes.object.isRequired, // event whose sender we're showing
-        aux: React.PropTypes.object, // stuff to go after the sender name, if anything
+        aux: React.PropTypes.string, // stuff to go after the sender name, if anything
         onClick: React.PropTypes.func,
     },