diff --git a/commons/src/utils/deep-partial.ts b/commons/src/utils/deep-partial.ts
index 5777c99e6..8b8d27353 100644
--- a/commons/src/utils/deep-partial.ts
+++ b/commons/src/utils/deep-partial.ts
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ * SPDX-FileCopyrightText: 2025 The HedgeDoc developers (see AUTHORS file)
  *
  * SPDX-License-Identifier: AGPL-3.0-only
  */
@@ -7,7 +7,7 @@
 export type DeepPartial<T> = T extends null | undefined
   ? T
   : T extends Array<infer ArrayType>
-    ? Array<DeepPartial<ArrayType>>
+    ? Array<DeepPartial<ArrayType>> | undefined
     : T extends Record<string | number | symbol, unknown>
-      ? { [P in keyof T]?: DeepPartial<T[P]> }
-      : T
+      ? { [P in keyof T]?: DeepPartial<T[P]> } | undefined
+      : Partial<T>