diff --git a/packages/backend/src/core/SearchService.ts b/packages/backend/src/core/SearchService.ts
index d16f9eb6bd..0063dbc762 100644
--- a/packages/backend/src/core/SearchService.ts
+++ b/packages/backend/src/core/SearchService.ts
@@ -85,14 +85,14 @@ const fileTypes = {
 };
 
 // Make sure to regenerate misskey-js and check search.note.vue after changing these
-export const fileTypeCategories = ['image', 'video', 'audio', 'module', 'flash'] as const;
+export const fileTypeCategories = ['image', 'video', 'audio', 'module', 'flash', null] as const;
 export type FileTypeCategory = typeof fileTypeCategories[number];
 
 export type SearchOpts = {
 	userId?: MiNote['userId'] | null;
 	channelId?: MiNote['channelId'] | null;
 	host?: string | null;
-	filetype?: FileTypeCategory | null;
+	filetype?: FileTypeCategory;
 	order?: string | null;
 	disableMeili?: boolean | null;
 };
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 258254ad02..9bac7a812c 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -25901,7 +25901,7 @@ export type operations = {
           /** @description The local host is represented with `.`. */
           host?: string;
           /** @enum {string|null} */
-          filetype?: 'image' | 'video' | 'audio' | 'module' | 'flash';
+          filetype?: 'image' | 'video' | 'audio' | 'module' | 'flash' | null;
           /**
            * Format: misskey:id
            * @default null