diff --git a/packages/react-query/src/__tests__/prefetch.test.tsx b/packages/react-query/src/__tests__/prefetch.test.tsx
index 760047782e..1b111b57ad 100644
--- a/packages/react-query/src/__tests__/prefetch.test.tsx
+++ b/packages/react-query/src/__tests__/prefetch.test.tsx
@@ -16,11 +16,13 @@ import type { InfiniteData, UseInfiniteQueryOptions, UseQueryOptions } from '..'
 import type { Mock } from 'vitest'
 
 const generateQueryFn = (data: string) =>
-  vi.fn<any, Promise<string>>().mockImplementation(async () => {
-    await sleep(10)
+  vi
+    .fn<(...args: Array<any>) => Promise<string>>()
+    .mockImplementation(async () => {
+      await sleep(10)
 
-    return data
-  })
+      return data
+    })
 
 const generateInfiniteQueryOptions = (
   data: Array<{ data: string; currentPage: number; totalPages: number }>,
@@ -29,7 +31,7 @@ const generateInfiniteQueryOptions = (
 
   return {
     queryFn: vi
-      .fn<any, Promise<(typeof data)[number]>>()
+      .fn<(...args: Array<any>) => Promise<(typeof data)[number]>>()
       .mockImplementation(async () => {
         const currentPageData = data[currentPage]
         if (!currentPageData) {
diff --git a/packages/react-query/src/__tests__/ssr-hydration.test.tsx b/packages/react-query/src/__tests__/ssr-hydration.test.tsx
index 0e875c5852..907663472a 100644
--- a/packages/react-query/src/__tests__/ssr-hydration.test.tsx
+++ b/packages/react-query/src/__tests__/ssr-hydration.test.tsx
@@ -46,10 +46,7 @@ describe('Server side rendering with de/rehydration', () => {
     const consoleMock = vi.spyOn(console, 'error')
     consoleMock.mockImplementation(() => undefined)
 
-    const fetchDataSuccess = vi.fn<
-      Parameters<typeof fetchData>,
-      ReturnType<typeof fetchData>
-    >(fetchData)
+    const fetchDataSuccess = vi.fn<typeof fetchData>(fetchData)
 
     // -- Shared part --
     function SuccessComponent() {
@@ -203,10 +200,7 @@ describe('Server side rendering with de/rehydration', () => {
     const consoleMock = vi.spyOn(console, 'error')
     consoleMock.mockImplementation(() => undefined)
 
-    const fetchDataSuccess = vi.fn<
-      Parameters<typeof fetchData>,
-      ReturnType<typeof fetchData>
-    >(fetchData)
+    const fetchDataSuccess = vi.fn<typeof fetchData>(fetchData)
 
     // -- Shared part --
     function SuccessComponent() {
diff --git a/packages/react-query/src/__tests__/useInfiniteQuery.test.tsx b/packages/react-query/src/__tests__/useInfiniteQuery.test.tsx
index b4024f3c62..716867a57a 100644
--- a/packages/react-query/src/__tests__/useInfiniteQuery.test.tsx
+++ b/packages/react-query/src/__tests__/useInfiniteQuery.test.tsx
@@ -920,11 +920,10 @@ describe('useInfiniteQuery', () => {
   it('should silently cancel an ongoing fetchNextPage request when another fetchNextPage is invoked', async () => {
     const key = queryKey()
     const start = 10
-    const onAborts: Array<Mock<any, any>> = []
-    const abortListeners: Array<Mock<any, any>> = []
+    const onAborts: Array<Mock<(...args: Array<any>) => any>> = []
+    const abortListeners: Array<Mock<(...args: Array<any>) => any>> = []
     const fetchPage = vi.fn<
-      [QueryFunctionContext<typeof key, number>],
-      Promise<number>
+      (context: QueryFunctionContext<typeof key, number>) => Promise<number>
     >(async ({ pageParam, signal }) => {
       const onAbort = vi.fn()
       const abortListener = vi.fn()
@@ -996,11 +995,10 @@ describe('useInfiniteQuery', () => {
   it('should not cancel an ongoing fetchNextPage request when another fetchNextPage is invoked if `cancelRefetch: false` is used ', async () => {
     const key = queryKey()
     const start = 10
-    const onAborts: Array<Mock<any, any>> = []
-    const abortListeners: Array<Mock<any, any>> = []
+    const onAborts: Array<Mock<(...args: Array<any>) => any>> = []
+    const abortListeners: Array<Mock<(...args: Array<any>) => any>> = []
     const fetchPage = vi.fn<
-      [QueryFunctionContext<typeof key, number>],
-      Promise<number>
+      (context: QueryFunctionContext<typeof key, number>) => Promise<number>
     >(async ({ pageParam, signal }) => {
       const onAbort = vi.fn()
       const abortListener = vi.fn()
diff --git a/packages/react-query/src/__tests__/utils.tsx b/packages/react-query/src/__tests__/utils.tsx
index f640fd3d7b..4544c39a3c 100644
--- a/packages/react-query/src/__tests__/utils.tsx
+++ b/packages/react-query/src/__tests__/utils.tsx
@@ -48,13 +48,13 @@ export function createQueryClient(config?: QueryClientConfig): QueryClient {
 
 export function mockVisibilityState(
   value: DocumentVisibilityState,
-): MockInstance<[], DocumentVisibilityState> {
+): MockInstance<() => DocumentVisibilityState> {
   return vi.spyOn(document, 'visibilityState', 'get').mockReturnValue(value)
 }
 
 export function mockOnlineManagerIsOnline(
   value: boolean,
-): MockInstance<[], boolean> {
+): MockInstance<() => boolean> {
   return vi.spyOn(onlineManager, 'isOnline').mockReturnValue(value)
 }