diff --git a/packages/backend/src/config/load.ts b/packages/backend/src/config/load.ts
index 9654a4f3b..d82c8a396 100644
--- a/packages/backend/src/config/load.ts
+++ b/packages/backend/src/config/load.ts
@@ -28,6 +28,8 @@ export default function load() {
 	const clientManifest = JSON.parse(fs.readFileSync(`${_dirname}/../../../../built/_client_dist_/manifest.json`, 'utf-8'));
 	const config = yaml.load(fs.readFileSync(path, 'utf-8')) as Source;
 
+	if (config.id && config.id !== 'aid') throw new Error('Unsupported ID algorithm. Only "aid" is supported.');
+
 	const mixin = {} as Mixin;
 
 	const url = tryCreateUrl(config.url);