diff --git a/app/client/src/utils/autocomplete/EntityDefinitions.ts b/app/client/src/utils/autocomplete/EntityDefinitions.ts
index b36a8cb6c0..baef8e9b5c 100644
--- a/app/client/src/utils/autocomplete/EntityDefinitions.ts
+++ b/app/client/src/utils/autocomplete/EntityDefinitions.ts
@@ -673,7 +673,7 @@ export const GLOBAL_FUNCTIONS = {
   postMessageToTargetWindow: {
     "!doc":
       "Establish cross-origin communication between Window objects/page and iframes",
-    "!type": "fn(message: any, targetOrigin: any, transfer: [any])",
+    "!type": "fn(message: any, targetOrigin: string, transfer: [any])",
   },
 };
 
diff --git a/app/client/src/workers/Actions.ts b/app/client/src/workers/Actions.ts
index 795d12bf13..fdce74cb5b 100644
--- a/app/client/src/workers/Actions.ts
+++ b/app/client/src/workers/Actions.ts
@@ -261,7 +261,7 @@ const DATA_TREE_FUNCTIONS: Record<
         };
       },
   },
-  postMessageToTargetWindow: function(message: any, targetOrigin: string) {
+  postMessageToTargetWindow: function(message: unknown, targetOrigin: string) {
     return {
       type: ActionTriggerType.POST_MESSAGE,
       payload: {