diff --git a/package.json b/package.json
index bbf7187..1db8382 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
   },
   "scripts": {
     "start": "react-scripts start",
-    "build": "react-scripts build",
+    "build": "REACT_APP_SCANNER_ENDPOINT=ws://localhost:3001 react-scripts build",
     "test": "react-scripts test",
     "test:ci": "react-scripts test --ci --watchAll=false",
     "test:coverage": "react-scripts test --coverage --watchAll=false",