diff --git a/package.json b/package.json
index 46764c4..e9977d8 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "build-visu": "cd ../visualization-component && yarn build:webcomponents",
     "build": "npm run electron:serve-tsc && ng build --base-href ./",
     "build:dev": "npm run build -- -c dev",
-    "build:prod": "node set-env.js && npm run build -- -c production && npm run removeMocks",
+    "build:prod": "node ./scripts/set-env.js && npm run build -- -c production && npm run removeMocks",
     "web:build": "npm run build -- -c web-production",
     "electron": "electron",
     "electron:serve-tsc": "tsc -p tsconfig.serve.json",
diff --git a/scripts/set-env.js b/scripts/set-env.js
index 146d66d..7b171a5 100644
--- a/scripts/set-env.js
+++ b/scripts/set-env.js
@@ -3,10 +3,11 @@ const fs = require("fs");
 const envFilePath = "./src/environments/environment.prod.ts";
 let envFileContent = fs.readFileSync(envFilePath, "utf8");
 const trackerId = process.env.TRACKER_ID;
-if (!envFileContent.includes("TRACKER_ID")) {
-  envFileContent = envFileContent.replace(
-    /}\s*$/,
-    `  TRACKER_ID: "${trackerId}",\n}`
-  );
-}
-fs.writeFileSync(envFilePath, envFileContent);
+
+// insert trackerId to the env file
+let index = envFileContent.indexOf("{");
+let res =
+  envFileContent.slice(0, index + 1) +
+  `  TRACKER_ID: "${trackerId}",` +
+  envFileContent.slice(index + 1);
+fs.writeFileSync(envFilePath, res);