diff --git a/build-utils.js b/build-utils.js
index c67244960b7..0ccc11d5016 100644
--- a/build-utils.js
+++ b/build-utils.js
@@ -1,16 +1,18 @@
 const dotenv = require('dotenv');
 const path = require("path");
 
-dotenv.config();
-
 function defineEnvVars() {
+    dotenv.config();
+
     const defines = {};
 
     for (const envVar of Object.keys(process.env)) {
         const value = process.env[envVar].trim();
 
         let replacement;
-        if (value.trim() === 'true' || value.trim() === 'false' || !Number.isNaN(parseFloat(value))) {
+        if (value.trim() === 'true' || value.trim() === 'false') {
+            replacement = value;
+        } else if (!Number.isNaN(parseFloat(value))) {
             replacement = parseFloat(value).toString();
         } else {
             replacement = `"${value}"`;
@@ -25,13 +27,16 @@ function defineEnvVars() {
 module.exports.defineEnvVars = defineEnvVars;
 
 /**
+ * @param projectRoot {string} the project root folder, as a path relative to the root of the repository
  * @param globalName {string|undefined} the name of the global to define in the output IIFE
  * @param entryPoint {string} the entrypoint path, as an absolute path
  * @param outFile {string} the output file path, as a path relative to the root of the repository
  */
-function esbuildModuleBuild(globalName, entryPoint, outFile) {
+function esbuildModuleBuild(projectRoot, globalName, entryPoint, outFile) {
     const isProductionBuild = process.env.A32NX_PRODUCTION_BUILD === '1';
 
+    process.chdir(projectRoot);
+
     return {
         absWorkingDir: __dirname,
 
diff --git a/fbw-a32nx/src/systems/atsu/fmsclient/build.js b/fbw-a32nx/src/systems/atsu/fmsclient/build.js
index ea01837ce66..cc368667c28 100644
--- a/fbw-a32nx/src/systems/atsu/fmsclient/build.js
+++ b/fbw-a32nx/src/systems/atsu/fmsclient/build.js
@@ -10,4 +10,4 @@ const { esbuildModuleBuild } = require('#build-utils');
 
 const outFile = 'fbw-a32nx/out/flybywire-aircraft-a320-neo/html_ui/JS/fbw-a32nx/atsu/fmsclient.js';
 
-esbuild.build(esbuildModuleBuild('AtsuFmsClient', path.join(__dirname, 'src/index.ts'), outFile));
+esbuild.build(esbuildModuleBuild('fbw-a32nx', 'AtsuFmsClient', path.join(__dirname, 'src/index.ts'), outFile));
diff --git a/fbw-a32nx/src/systems/extras-host/build.js b/fbw-a32nx/src/systems/extras-host/build.js
index 8125a2a13a7..66ab9cabdfa 100644
--- a/fbw-a32nx/src/systems/extras-host/build.js
+++ b/fbw-a32nx/src/systems/extras-host/build.js
@@ -10,4 +10,4 @@ const { esbuildModuleBuild } = require('#build-utils');
 
 const outFile = 'fbw-a32nx/out/flybywire-aircraft-a320-neo/html_ui/Pages/VCockpit/Instruments/A32NX/ExtrasHost/index.js';
 
-esbuild.build(esbuildModuleBuild(undefined, path.join(__dirname, './index.ts'), outFile));
+esbuild.build(esbuildModuleBuild('fbw-a32nx', undefined, path.join(__dirname, './index.ts'), outFile));
diff --git a/fbw-a32nx/src/systems/fmgc/build.js b/fbw-a32nx/src/systems/fmgc/build.js
index 225dec8cea3..908c260da21 100644
--- a/fbw-a32nx/src/systems/fmgc/build.js
+++ b/fbw-a32nx/src/systems/fmgc/build.js
@@ -10,4 +10,4 @@ const { esbuildModuleBuild } = require('#build-utils');
 
 const outFile = 'fbw-a32nx/out/flybywire-aircraft-a320-neo/html_ui/JS/fbw-a32nx/fmgc/fmgc.js';
 
-esbuild.build(esbuildModuleBuild('Fmgc', path.join(__dirname, 'src/index.ts'), outFile));
+esbuild.build(esbuildModuleBuild('fbw-a32nx', 'Fmgc', path.join(__dirname, 'src/index.ts'), outFile));
diff --git a/fbw-a32nx/src/systems/sentry-client/build.js b/fbw-a32nx/src/systems/sentry-client/build.js
index 39634ea4fc4..6c229da1b4f 100644
--- a/fbw-a32nx/src/systems/sentry-client/build.js
+++ b/fbw-a32nx/src/systems/sentry-client/build.js
@@ -12,4 +12,4 @@ require('dotenv').config();
 
 const outFile = 'fbw-a32nx/out/flybywire-aircraft-a320-neo/html_ui/JS/fbw-a32nx/sentry-client/sentry-client.js';
 
-esbuild.build(esbuildModuleBuild(undefined, path.join(__dirname, 'src/index.ts'), outFile));
+esbuild.build(esbuildModuleBuild('fbw-a32nx', undefined, path.join(__dirname, 'src/index.ts'), outFile));
diff --git a/fbw-a32nx/src/systems/simbridge-client/build.js b/fbw-a32nx/src/systems/simbridge-client/build.js
index 628266f24fe..be7c3239616 100644
--- a/fbw-a32nx/src/systems/simbridge-client/build.js
+++ b/fbw-a32nx/src/systems/simbridge-client/build.js
@@ -10,4 +10,4 @@ const { esbuildModuleBuild } = require('#build-utils');
 
 const outFile = 'fbw-a32nx/out/flybywire-aircraft-a320-neo/html_ui/JS/fbw-a32nx/simbridge-client/simbridge-client.js';
 
-esbuild.build(esbuildModuleBuild('SimBridgeClient', path.join(__dirname, 'src/index.ts'), outFile));
+esbuild.build(esbuildModuleBuild('fbw-a32nx', 'SimBridgeClient', path.join(__dirname, 'src/index.ts'), outFile));
diff --git a/fbw-a32nx/src/systems/systems-host/build.js b/fbw-a32nx/src/systems/systems-host/build.js
index 0d3600748ee..ae97258c5cf 100644
--- a/fbw-a32nx/src/systems/systems-host/build.js
+++ b/fbw-a32nx/src/systems/systems-host/build.js
@@ -10,4 +10,4 @@ const { esbuildModuleBuild } = require('#build-utils');
 
 const outFile = 'fbw-a32nx/out/flybywire-aircraft-a320-neo/html_ui/Pages/VCockpit/Instruments/A32NX/SystemsHost/index.js';
 
-esbuild.build(esbuildModuleBuild(undefined, path.join(__dirname, './index.ts'), outFile));
+esbuild.build(esbuildModuleBuild('fbw-a32nx', undefined, path.join(__dirname, './index.ts'), outFile));
diff --git a/fbw-a32nx/src/systems/tcas/build.js b/fbw-a32nx/src/systems/tcas/build.js
index 99a4b6f7421..3516951e521 100644
--- a/fbw-a32nx/src/systems/tcas/build.js
+++ b/fbw-a32nx/src/systems/tcas/build.js
@@ -10,4 +10,4 @@ const { esbuildModuleBuild } = require('#build-utils');
 
 const outFile = 'fbw-a32nx/out/flybywire-aircraft-a320-neo/html_ui/JS/fbw-a32nx/tcas/tcas.js';
 
-esbuild.build(esbuildModuleBuild(undefined, path.join(__dirname, 'src/index.ts'), outFile));
+esbuild.build(esbuildModuleBuild('fbw-a32nx', undefined, path.join(__dirname, 'src/index.ts'), outFile));