diff --git a/src/plugins/usage_collection/server/collector/collector.ts b/src/plugins/usage_collection/server/collector/collector.ts
index 797fdaa06a620a..49daa08a56bc70 100644
--- a/src/plugins/usage_collection/server/collector/collector.ts
+++ b/src/plugins/usage_collection/server/collector/collector.ts
@@ -154,7 +154,7 @@ export class Collector<
   public readonly extendFetchContext: CollectorOptionsFetchExtendedContext<any>;
   public readonly type: CollectorOptions<TFetchReturn, UFormatBulkUploadPayload, any>['type'];
   public readonly init?: CollectorOptions<TFetchReturn, UFormatBulkUploadPayload, any>['init'];
-  public readonly fetch: CollectorFetchMethod<any, TFetchReturn, ExtraOptions>;
+  public readonly fetch: CollectorFetchMethod<boolean | undefined, TFetchReturn, ExtraOptions>;
   public readonly isReady: CollectorOptions<TFetchReturn, UFormatBulkUploadPayload, any>['isReady'];
   private readonly _formatForBulkUpload?: CollectorFormatForBulkUpload<
     TFetchReturn,