diff --git a/frontend/src/Widget.jsx b/frontend/src/Widget.jsx
index 365eb8a..7b8ccd7 100644
--- a/frontend/src/Widget.jsx
+++ b/frontend/src/Widget.jsx
@@ -370,7 +370,10 @@ function Widget() {
 
   // TODO: Sign and send a message to the forum-api bot / to a room in matrix
   const registerMatrixIdentity = async () => {
-    await widgetApi.current.sendRoomEvent('m.room.message', 'test message');
+    await widgetApi.current.sendRoomEvent('m.room.message', {
+      body: 'test message',
+      msgtype: 'm.text',
+    });
   };
 
   /* -------------------------------------------------------------------------------- */