diff --git a/packages/frontend/src/scripts/merge.ts b/packages/frontend/src/scripts/merge.ts
index 9794a300da..89fdda0cbb 100644
--- a/packages/frontend/src/scripts/merge.ts
+++ b/packages/frontend/src/scripts/merge.ts
@@ -18,7 +18,7 @@ function isPureObject(value: unknown): value is Record<string | number | symbol,
  * valueにないキーをdefからもらう（再帰的）\
  * nullはそのまま、undefinedはdefの値
  **/
-export function deepMerge<X extends Record<string | number | symbol, unknown>>(value: DeepPartial<X>, def: X): X {
+export function deepMerge<X extends object>(value: DeepPartial<X>, def: X): X {
 	if (isPureObject(value) && isPureObject(def)) {
 		const result = deepClone(value as Cloneable) as X;
 		for (const [k, v] of Object.entries(def) as [keyof X, X[keyof X]][]) {