diff --git a/packages/query-core/src/types.ts b/packages/query-core/src/types.ts
index c973b6a758f..1c59c743757 100644
--- a/packages/query-core/src/types.ts
+++ b/packages/query-core/src/types.ts
@@ -432,11 +432,6 @@ export interface QueryObserverOptions<
 export type WithRequired<TTarget, TKey extends keyof TTarget> = TTarget & {
   [_ in TKey]: {}
 }
-export type Optional<TTarget, TKey extends keyof TTarget> = Pick<
-  Partial<TTarget>,
-  TKey
-> &
-  OmitKeyof<TTarget, TKey>
 
 export type DefaultedQueryObserverOptions<
   TQueryFnData = unknown,