diff --git a/packages/backend/src/server/api/endpoints/ap/show.ts b/packages/backend/src/server/api/endpoints/ap/show.ts
index f62baf79e1..b89687acce 100644
--- a/packages/backend/src/server/api/endpoints/ap/show.ts
+++ b/packages/backend/src/server/api/endpoints/ap/show.ts
@@ -111,7 +111,7 @@ export const paramDef = {
 	type: 'object',
 	properties: {
 		uri: { type: 'string' },
-		onlyUriFetch: { type: 'boolean', optional: true, nullable: false },
+		onlyUriFetch: { type: 'boolean' },
 	},
 	required: ['uri'],
 } as const;