diff --git a/server/util/jsonify.ts b/server/util/jsonify.ts
index 10cb5d5..3ec8b4c 100644
--- a/server/util/jsonify.ts
+++ b/server/util/jsonify.ts
@@ -1,5 +1,4 @@
 import { every, isString } from "lodash-es";
-import { symbol } from "zod";
 
 type JsonifiableLite =
     string | number | boolean | bigint | null | undefined |
@@ -31,7 +30,7 @@ export type Jsonified<T extends Jsonifiable> =
     T extends Set<infer V extends Jsonifiable> ? Jsonified<V>[] :
     T extends object ? (
         T extends { jsonify(): infer V extends Jsonifiable } ? Jsonified<V> : //HACK: jsonify()는 Jsonified여야 함
-        {[key in keyof T]: Jsonified<T[key]>}): //FIXME: keyof T에 symbol을 받을 수 없어야 함
+        {[key in keyof T]: Jsonified<T[key]>}):
     T extends unknown ? unknown :
     never;