diff --git a/lib/serve.js b/lib/serve.js
index 5966386..4e33340 100644
--- a/lib/serve.js
+++ b/lib/serve.js
@@ -11,6 +11,11 @@ module.exports = async (file, flags, restarting) => {
   // Ensure that the loaded files have the correct env
   process.env.NODE_ENV = process.env.NODE_ENV || 'development'
 
+  // Emit SIGNUSR2 to signal restart to user code
+  if (restarting) {
+    process.emit('SIGNUSR2')
+  }
+
   // And then load the files
   const module = flags.silent ? getModule(file) : log(getModule(file))
   const server = serve(module)