diff --git a/daemon/web/vite.config.ts b/daemon/web/vite.config.ts
index c10a3cf..daa0d9b 100644
--- a/daemon/web/vite.config.ts
+++ b/daemon/web/vite.config.ts
@@ -28,6 +28,10 @@ export default defineConfig({
     },
     plugins: [sveltekit()],
     build: {
+        // Keep the generated bundle compatible with older mobile browsers.
+        // The default Vite target follows a modern baseline that can be too new
+        // for older iOS Safari releases reported in issue #903.
+        target: ['es2018', 'safari12'],
         // Force everything into one HTML file. SvelteKit will still generate
         // a lot of JS files but they are deadweight and will not be included
         // in the rust binary.