diff --git a/.changeset/issue-145.md b/.changeset/issue-145.md
new file mode 100644
index 00000000..fb1dc332
--- /dev/null
+++ b/.changeset/issue-145.md
@@ -0,0 +1,7 @@
+---
+'electron-trpc': patch
+---
+
+Fix `handleIPCMessage` only sending replies to Electron's main frame.
+
+pr: 146
diff --git a/packages/electron-trpc/src/main/__tests__/handleIPCMessage.test.ts b/packages/electron-trpc/src/main/__tests__/handleIPCMessage.test.ts
index 3b7aafb1..a6b02e82 100644
--- a/packages/electron-trpc/src/main/__tests__/handleIPCMessage.test.ts
+++ b/packages/electron-trpc/src/main/__tests__/handleIPCMessage.test.ts
@@ -4,17 +4,16 @@ import * as trpc from '@trpc/server';
 import { observable } from '@trpc/server/observable';
 import { EventEmitter } from 'events';
 import { handleIPCMessage } from '../handleIPCMessage';
-import { IpcMainInvokeEvent } from 'electron';
+import { IpcMainEvent } from 'electron';
 
 interface MockEvent {
+  reply: MockedFunction<any>;
   sender: {
     isDestroyed: () => boolean;
     on: (event: string, cb: () => void) => void;
-    send: MockedFunction<any>;
   };
 }
-const makeEvent = (event: MockEvent) =>
-  event as unknown as IpcMainInvokeEvent & { sender: { send: MockedFunction<any> } };
+const makeEvent = (event: MockEvent) => event as unknown as IpcMainEvent & Pick<MockEvent, 'reply'>;
 
 const ee = new EventEmitter();
 
@@ -44,10 +43,10 @@ const testRouter = t.router({
 describe('api', () => {
   test('handles queries', async () => {
     const event = makeEvent({
+      reply: vi.fn(),
       sender: {
         isDestroyed: () => false,
         on: () => {},
-        send: vi.fn(),
       },
     });
 
@@ -69,8 +68,8 @@ describe('api', () => {
       subscriptions: new Map(),
     });
 
-    expect(event.sender.send).toHaveBeenCalledOnce();
-    expect(event.sender.send.mock.lastCall[1]).toMatchObject({
+    expect(event.reply).toHaveBeenCalledOnce();
+    expect(event.reply.mock.lastCall![1]).toMatchObject({
       id: 1,
       result: {
         data: {
@@ -83,10 +82,10 @@ describe('api', () => {
 
   test('does not respond if sender is gone', async () => {
     const event = makeEvent({
+      reply: vi.fn(),
       sender: {
         isDestroyed: () => true,
         on: () => {},
-        send: vi.fn(),
       },
     });
 
@@ -108,15 +107,15 @@ describe('api', () => {
       subscriptions: new Map(),
     });
 
-    expect(event.sender.send).not.toHaveBeenCalled();
+    expect(event.reply).not.toHaveBeenCalled();
   });
 
   test('handles subscriptions', async () => {
     const event = makeEvent({
+      reply: vi.fn(),
       sender: {
         isDestroyed: () => false,
         on: () => {},
-        send: vi.fn(),
       },
     });
 
@@ -138,12 +137,12 @@ describe('api', () => {
       event,
     });
 
-    expect(event.sender.send).not.toHaveBeenCalled();
+    expect(event.reply).not.toHaveBeenCalled();
 
     ee.emit('test');
 
-    expect(event.sender.send).toHaveBeenCalledOnce();
-    expect(event.sender.send.mock.lastCall[1]).toMatchObject({
+    expect(event.reply).toHaveBeenCalledOnce();
+    expect(event.reply.mock.lastCall![1]).toMatchObject({
       id: 1,
       result: {
         data: 'test response',
@@ -153,10 +152,10 @@ describe('api', () => {
 
   test('subscription responds using custom serializer', async () => {
     const event = makeEvent({
+      reply: vi.fn(),
       sender: {
         isDestroyed: () => false,
         on: () => {},
-        send: vi.fn(),
       },
     });
 
@@ -203,12 +202,12 @@ describe('api', () => {
       event,
     });
 
-    expect(event.sender.send).not.toHaveBeenCalled();
+    expect(event.reply).not.toHaveBeenCalled();
 
     ee.emit('test');
 
-    expect(event.sender.send).toHaveBeenCalledOnce();
-    expect(event.sender.send.mock.lastCall[1]).toMatchObject({
+    expect(event.reply).toHaveBeenCalledOnce();
+    expect(event.reply.mock.lastCall![1]).toMatchObject({
       id: 1,
       result: {
         type: 'data',
diff --git a/packages/electron-trpc/src/main/createIPCHandler.ts b/packages/electron-trpc/src/main/createIPCHandler.ts
index 67801f44..658b52e7 100644
--- a/packages/electron-trpc/src/main/createIPCHandler.ts
+++ b/packages/electron-trpc/src/main/createIPCHandler.ts
@@ -1,6 +1,6 @@
 import type { AnyRouter, inferRouterContext } from '@trpc/server';
 import { ipcMain } from 'electron';
-import type { BrowserWindow, IpcMainInvokeEvent } from 'electron';
+import type { BrowserWindow, IpcMainEvent } from 'electron';
 import { handleIPCMessage } from './handleIPCMessage';
 import { CreateContextOptions } from './types';
 import { ELECTRON_TRPC_CHANNEL } from '../constants';
@@ -9,7 +9,7 @@ import { Unsubscribable } from '@trpc/server/observable';
 
 type Awaitable<T> = T | Promise<T>;
 
-const getInternalId = (event: IpcMainInvokeEvent, request: ETRPCRequest) => {
+const getInternalId = (event: IpcMainEvent, request: ETRPCRequest) => {
   const messageId = request.method === 'request' ? request.operation.id : request.id;
   return `${event.sender.id}-${event.senderFrame.routingId}:${messageId}`;
 };
@@ -29,7 +29,7 @@ class IPCHandler<TRouter extends AnyRouter> {
   }) {
     windows.forEach((win) => this.attachWindow(win));
 
-    ipcMain.on(ELECTRON_TRPC_CHANNEL, (event: IpcMainInvokeEvent, request: ETRPCRequest) => {
+    ipcMain.on(ELECTRON_TRPC_CHANNEL, (event: IpcMainEvent, request: ETRPCRequest) => {
       handleIPCMessage({
         router,
         createContext,
diff --git a/packages/electron-trpc/src/main/handleIPCMessage.ts b/packages/electron-trpc/src/main/handleIPCMessage.ts
index 325807e8..d7347b1e 100644
--- a/packages/electron-trpc/src/main/handleIPCMessage.ts
+++ b/packages/electron-trpc/src/main/handleIPCMessage.ts
@@ -1,7 +1,7 @@
 import { callProcedure, TRPCError } from '@trpc/server';
 import type { AnyRouter, inferRouterContext } from '@trpc/server';
 import type { TRPCResponseMessage } from '@trpc/server/rpc';
-import type { IpcMainInvokeEvent } from 'electron';
+import type { IpcMainEvent } from 'electron';
 import { isObservable, Unsubscribable } from '@trpc/server/observable';
 import { CreateContextOptions } from './types';
 import { getTRPCErrorFromUnknown, transformTRPCResponseItem } from './utils';
@@ -20,7 +20,7 @@ export async function handleIPCMessage<TRouter extends AnyRouter>({
   createContext?: (opts: CreateContextOptions) => Promise<inferRouterContext<TRouter>>;
   internalId: string;
   message: ETRPCRequest;
-  event: IpcMainInvokeEvent;
+  event: IpcMainEvent;
   subscriptions: Map<string, Unsubscribable>;
 }) {
   if (message.method === 'subscription.stop') {
@@ -43,7 +43,7 @@ export async function handleIPCMessage<TRouter extends AnyRouter>({
 
   const respond = (response: TRPCResponseMessage) => {
     if (event.sender.isDestroyed()) return;
-    event.sender.send(ELECTRON_TRPC_CHANNEL, transformTRPCResponseItem(router, response));
+    event.reply(ELECTRON_TRPC_CHANNEL, transformTRPCResponseItem(router, response));
   };
 
   try {