diff --git a/packages/query-core/src/infiniteQueryObserver.ts b/packages/query-core/src/infiniteQueryObserver.ts
index 59d6efa259..b1c18ac01c 100644
--- a/packages/query-core/src/infiniteQueryObserver.ts
+++ b/packages/query-core/src/infiniteQueryObserver.ts
@@ -4,6 +4,7 @@ import {
   hasPreviousPage,
   infiniteQueryBehavior,
 } from './infiniteQueryBehavior'
+import type { Subscribable } from './subscribable'
 import type {
   DefaultError,
   DefaultedInfiniteQueryObserverOptions,
@@ -16,7 +17,7 @@ import type {
   QueryKey,
 } from './types'
 import type { QueryClient } from './queryClient'
-import type { NotifyOptions, ObserverFetchOptions } from './queryObserver'
+import type { NotifyOptions } from './queryObserver'
 import type { Query } from './query'
 
 type InfiniteQueryObserverListener<TData, TError> = (
@@ -38,17 +39,33 @@ export class InfiniteQueryObserver<
   TQueryKey
 > {
   // Type override
-  subscribe!: (
-    listener?: InfiniteQueryObserverListener<TData, TError>,
-  ) => () => void
+  subscribe!: Subscribable<
+    InfiniteQueryObserverListener<TData, TError>
+  >['subscribe']
 
   // Type override
-  getCurrentResult!: () => InfiniteQueryObserverResult<TData, TError>
+  getCurrentResult!: ReplaceReturnType<
+    QueryObserver<
+      TQueryFnData,
+      TError,
+      TData,
+      InfiniteData<TQueryData, TPageParam>,
+      TQueryKey
+    >['getCurrentResult'],
+    InfiniteQueryObserverResult<TData, TError>
+  >
 
   // Type override
-  protected fetch!: (
-    fetchOptions: ObserverFetchOptions,
-  ) => Promise<InfiniteQueryObserverResult<TData, TError>>
+  protected fetch!: ReplaceReturnType<
+    QueryObserver<
+      TQueryFnData,
+      TError,
+      TData,
+      InfiniteData<TQueryData, TPageParam>,
+      TQueryKey
+    >['fetch'],
+    Promise<InfiniteQueryObserverResult<TData, TError>>
+  >
 
   constructor(
     client: QueryClient,
@@ -176,3 +193,8 @@ export class InfiniteQueryObserver<
     return result as InfiniteQueryObserverResult<TData, TError>
   }
 }
+
+type ReplaceReturnType<
+  TFunction extends (...args: Array<any>) => unknown,
+  TReturn,
+> = (...args: Parameters<TFunction>) => TReturn
diff --git a/packages/query-core/src/queryObserver.ts b/packages/query-core/src/queryObserver.ts
index 0a73184241..2971bc6d1a 100644
--- a/packages/query-core/src/queryObserver.ts
+++ b/packages/query-core/src/queryObserver.ts
@@ -34,7 +34,7 @@ export interface NotifyOptions {
   listeners?: boolean
 }
 
-export interface ObserverFetchOptions extends FetchOptions {
+interface ObserverFetchOptions extends FetchOptions {
   throwOnError?: boolean
 }