diff --git a/src/routes/api_docs.ts b/src/routes/api_docs.ts
index 4f8e65b52..1535265c3 100644
--- a/src/routes/api_docs.ts
+++ b/src/routes/api_docs.ts
@@ -4,11 +4,12 @@ import { readFile } from "fs/promises";
 import { fileURLToPath } from "url";
 import { dirname, join } from "path";
 import yaml from "js-yaml";
+import type { JsonObject } from "swagger-ui-express";
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const swaggerDocument = yaml.load(
     await readFile(join(__dirname, "../etapi/etapi.openapi.yaml"), "utf8")
-) as object;
+) as JsonObject;
 
 function register(router: Router) {
     router.use(