diff --git a/.changeset/olive-chefs-jam.md b/.changeset/olive-chefs-jam.md
new file mode 100644
index 00000000000..168d26cc22f
--- /dev/null
+++ b/.changeset/olive-chefs-jam.md
@@ -0,0 +1,5 @@
+---
+"@remix-run/dev": patch
+---
+
+kill app server when remix dev terminates
diff --git a/packages/remix-dev/devServer_unstable/index.ts b/packages/remix-dev/devServer_unstable/index.ts
index e54047b43ef..3aa9ffe4bd1 100644
--- a/packages/remix-dev/devServer_unstable/index.ts
+++ b/packages/remix-dev/devServer_unstable/index.ts
@@ -7,6 +7,7 @@ import prettyMs from "pretty-ms";
 import execa from "execa";
 import express from "express";
 import pc from "picocolors";
+import exitHook from "exit-hook";
 
 import * as Channel from "../channel";
 import { type Manifest } from "../manifest";
@@ -267,6 +268,12 @@ export let serve = async (
 
   server.listen(options.port);
 
+  exitHook(() => {
+    state.appServer?.pid && kill(state.appServer.pid);
+    websocket.close();
+    server.close();
+  });
+
   return new Promise(() => {}).finally(async () => {
     state.appServer?.pid && (await kill(state.appServer.pid));
     websocket.close();