diff --git a/src/assets_dev_server.ts b/src/assets_dev_server.ts
index 342eaf5..88516c6 100644
--- a/src/assets_dev_server.ts
+++ b/src/assets_dev_server.ts
@@ -128,6 +128,7 @@ export class AssetsDevServer {
      */
     this.#devServer = run(this.#cwd, {
       script: this.#options.cmd,
+      reject: true,
 
       /**
        * We do not inherit the stdio for vite and encore, because in
diff --git a/src/bundler.ts b/src/bundler.ts
index b42cc4f..fd932ec 100644
--- a/src/bundler.ts
+++ b/src/bundler.ts
@@ -113,6 +113,7 @@ export class Bundler {
       this.#logger.info('compiling frontend assets', { suffix: assetsBundler.cmd })
       await run(this.#cwd, {
         stdio: 'inherit',
+        reject: true,
         script: assetsBundler.cmd,
         scriptArgs: assetsBundler.args,
       })
diff --git a/src/dev_server.ts b/src/dev_server.ts
index 39034fa..b34fdf2 100644
--- a/src/dev_server.ts
+++ b/src/dev_server.ts
@@ -174,6 +174,7 @@ export class DevServer {
       script: this.#scriptFile,
       env: { PORT: port, ...this.#options.env },
       nodeArgs: this.#options.nodeArgs,
+      reject: true,
       scriptArgs: this.#options.scriptArgs,
     })
 
diff --git a/src/test_runner.ts b/src/test_runner.ts
index 0842597..eb77241 100644
--- a/src/test_runner.ts
+++ b/src/test_runner.ts
@@ -228,6 +228,7 @@ export class TestRunner {
 
     this.#testScript = runNode(this.#cwd, {
       script: this.#scriptFile,
+      reject: true,
       env: { PORT: port, ...this.#options.env },
       nodeArgs: this.#options.nodeArgs,
       scriptArgs,