diff --git a/packages/addon/src/channel_selector.ts b/packages/addon/src/channel_selector.ts
index dbbe2c3d9..c496ec2f6 100644
--- a/packages/addon/src/channel_selector.ts
+++ b/packages/addon/src/channel_selector.ts
@@ -91,7 +91,7 @@ window.addEventListener("load", () => {
   const expand = () => {
     document.body.setAttribute("data-expanded", "true");
     myPort.postMessage({
-      type: "iframeRestyle",
+      type: "fdc3UserInterfaceRestyle",
       payload: {
         updatedCSS: {
           width: `100%`,