diff --git a/examples/firebase/functions/package.json b/examples/firebase/functions/package.json
index 5cc1366..841021c 100644
--- a/examples/firebase/functions/package.json
+++ b/examples/firebase/functions/package.json
@@ -2,7 +2,7 @@
 	"name": "functions",
 	"description": "Cloud Functions for Firebase",
 	"scripts": {
-		"serve": "npx firebase emulators:start --only functions",
+		"serve": "npm run build && npx firebase emulators:start --only functions",
 		"shell": "npx firebase functions:shell",
 		"start": "npm run shell",
 		"deploy": "npx firebase deploy --only functions",