diff --git a/ext/src/background/ShimManager.ts b/ext/src/background/ShimManager.ts
index 39d3ca8..8fbd69c 100644
--- a/ext/src/background/ShimManager.ts
+++ b/ext/src/background/ShimManager.ts
@@ -145,7 +145,7 @@ export default new class ShimManager {
         }
 
         switch (message.subject) {
-            case "main:/shimInitialized": {
+            case "main:/shimReady": {
                 shim.requestedAppId = message.data.appId;
 
                 for (const receiver of StatusManager.getReceivers()) {
diff --git a/ext/src/messaging.ts b/ext/src/messaging.ts
index f373358..bdf44ed 100644
--- a/ext/src/messaging.ts
+++ b/ext/src/messaging.ts
@@ -25,7 +25,7 @@ type MessagesBase = {
   , "receiverSelector:/selected": ReceiverSelection
   , "receiverSelector:/stop": ReceiverSelection
 
-  , "main:/shimInitialized": { appId: string }
+  , "main:/shimReady": { appId: string }
 
   , "main:/selectReceiverBegin": {}
   , "shim:/selectReceiverEnd": ReceiverSelectionCast
diff --git a/ext/src/shim/cast/index.ts b/ext/src/shim/cast/index.ts
index e4b4235..de1aabb 100755
--- a/ext/src/shim/cast/index.ts
+++ b/ext/src/shim/cast/index.ts
@@ -102,7 +102,7 @@ export function initialize (
     apiConfig = newApiConfig;
 
     sendMessageResponse({
-        subject: "main:/shimInitialized"
+        subject: "main:/shimReady"
       , data: { appId: apiConfig.sessionRequest.appId }
     });