diff --git a/src/global.d.ts b/src/global.d.ts
index 33af37cb18..d510b3e678 100644
--- a/src/global.d.ts
+++ b/src/global.d.ts
@@ -19,6 +19,6 @@ export declare global {
     const __JF_BUILD_VERSION__: string;
     const __PACKAGE_JSON_NAME__: string;
     const __PACKAGE_JSON_VERSION__: string;
-    const __USE_SYSTEM_FONTS__: string;
-    const __WEBPACK_SERVE__: string;
+    const __USE_SYSTEM_FONTS__: boolean;
+    const __WEBPACK_SERVE__: boolean;
 }
diff --git a/webpack.common.js b/webpack.common.js
index 64aab1f0e4..46e372da34 100644
--- a/webpack.common.js
+++ b/webpack.common.js
@@ -63,8 +63,8 @@ const config = {
                     process.env.JELLYFIN_VERSION || 'Release'),
             __PACKAGE_JSON_NAME__: JSON.stringify(packageJson.name),
             __PACKAGE_JSON_VERSION__: JSON.stringify(packageJson.version),
-            __USE_SYSTEM_FONTS__: JSON.stringify(!!process.env.USE_SYSTEM_FONTS),
-            __WEBPACK_SERVE__: JSON.stringify(!!process.env.WEBPACK_SERVE)
+            __USE_SYSTEM_FONTS__: !!JSON.parse(process.env.USE_SYSTEM_FONTS || '0'),
+            __WEBPACK_SERVE__: !!JSON.parse(process.env.WEBPACK_SERVE || '0')
         }),
         new CleanWebpackPlugin(),
         new HtmlWebpackPlugin({