diff --git a/package.json b/package.json
index 932f0895..93f5b054 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "scripts": {
     "dev": "cross-env MODE=chrome vite dev",
     "dev:firefox": "cross-env MODE=firefox vite build --watch",
-    "build": "cross-env MODE=chrome vite build && MODE=firefox vite build",
+    "build": "cross-env MODE=chrome vite build && cross-env MODE=firefox vite build",
     "build:chrome": "cross-env MODE=chrome vite build",
     "build:firefox": "cross-env MODE=firefox vite build",
     "build:safari": "cross-env MODE=safari vite build",