diff --git a/query/src/lib/utils.ts b/query/src/lib/utils.ts
index e35b8a4..70f61e5 100644
--- a/query/src/lib/utils.ts
+++ b/query/src/lib/utils.ts
@@ -1,6 +1,7 @@
 import {
+  DefaultError,
   QueryObserverResult,
-  QueryObserverSuccessResult,
+  QueryObserverSuccessResult
 } from '@tanstack/query-core';
 import { Observable, Subject, firstValueFrom, takeUntil } from 'rxjs';
 
@@ -23,9 +24,9 @@ export function toPromise<T>({
   return firstValueFrom(source.pipe(signal ? takeUntil(cancel) : (s) => s));
 }
 
-export function createSuccessObserverResult<T>(
+export function createSuccessObserverResult<T, Error = DefaultError>(
   data: T,
-): QueryObserverResult<T> {
+): QueryObserverResult<T, Error> {
   return {
     data,
     isLoading: false,
@@ -34,10 +35,10 @@ export function createSuccessObserverResult<T>(
     isPending: false,
     isSuccess: true,
     status: 'success',
-  } as QueryObserverSuccessResult<T>;
+  } as QueryObserverSuccessResult<T, Error>;
 }
 
-export function createPendingObserverResult<T>(): QueryObserverResult<T> {
+export function createPendingObserverResult<T = unknown, Error = DefaultError>(): QueryObserverResult<T, Error> {
   return {
     isError: false,
     isLoading: true,
@@ -46,5 +47,5 @@ export function createPendingObserverResult<T>(): QueryObserverResult<T> {
     isSuccess: false,
     fetchStatus: 'fetching',
     status: 'pending',
-  } as QueryObserverResult<T>;
+  } as QueryObserverResult<T, Error>;
 }