diff --git a/Dockerfile b/Dockerfile
index 2bd91d1..0c9e0a5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -55,6 +55,7 @@ RUN npm -w packages/client run build
 
 # --- build admin ---
 
+ENV APP_ROOT /admin
 RUN npm -w packages/admin run build
 
 # --- build server ---
diff --git a/packages/admin/src/main.tsx b/packages/admin/src/main.tsx
index ee14eb1..0a57ac3 100644
--- a/packages/admin/src/main.tsx
+++ b/packages/admin/src/main.tsx
@@ -31,7 +31,7 @@ const router = createBrowserRouter(
     },
   ],
   {
-    basename: import.meta.env.VITE_APP_ROOT,
+    basename: __APP_ROOT__,
   }
 );
 
diff --git a/packages/admin/src/vite-env.d.ts b/packages/admin/src/vite-env.d.ts
index 11f02fe..3a103a0 100644
--- a/packages/admin/src/vite-env.d.ts
+++ b/packages/admin/src/vite-env.d.ts
@@ -1 +1,3 @@
 /// <reference types="vite/client" />
+
+declare const __APP_ROOT__: string;
diff --git a/packages/admin/vite.config.ts b/packages/admin/vite.config.ts
index 5528bdb..33d602e 100644
--- a/packages/admin/vite.config.ts
+++ b/packages/admin/vite.config.ts
@@ -15,4 +15,7 @@ export default defineConfig({
       include: "**/*.{jsx,tsx}",
     }),
   ],
+  define: {
+    __APP_ROOT__: JSON.stringify(process.env.APP_ROOT),
+  },
 });
diff --git a/packages/server/src/lib/Express.ts b/packages/server/src/lib/Express.ts
index cd7a042..62632a4 100644
--- a/packages/server/src/lib/Express.ts
+++ b/packages/server/src/lib/Express.ts
@@ -69,17 +69,13 @@ export class ExpressServer {
       // client is needing to serve
       Logger.info(
         "Serving admin UI at /admin using root " +
-          path.join(__dirname, process.env.SERVE_ADMIN)
-      );
-      const assetsDir = path.join(__dirname, process.env.SERVE_ADMIN, "assets");
-      const indexFile = path.join(
-        __dirname,
-        process.env.SERVE_ADMIN,
-        "index.html"
+          path.join(process.env.SERVE_ADMIN)
       );
+      const assetsDir = path.join(process.env.SERVE_ADMIN, "assets");
+      const indexFile = path.join(process.env.SERVE_ADMIN, "index.html");
 
       this.app.use("/admin/assets", express.static(assetsDir));
-      this.app.use("/admin/*", (req, res) => {
+      this.app.use("/admin*", (req, res) => {
         res.sendFile(indexFile);
       });
     }