diff --git a/packages/svelte/types/index.d.ts b/packages/svelte/types/index.d.ts
index 25d291702d..2a1498378b 100644
--- a/packages/svelte/types/index.d.ts
+++ b/packages/svelte/types/index.d.ts
@@ -612,9 +612,9 @@ declare module 'svelte' {
 
 	type Hydratable = {
 		<T>(key: string, fn: () => T, options?: Transport<T>): T;
-		get: <T>(key: string) => T | undefined;
+		get: <T>(key: string, options?: { decode?: Decode<T> }) => T | undefined;
 		has: (key: string) => boolean;
-		set: <T>(key: string, value: T, options?: Transport<T>) => void;
+		set: <T>(key: string, value: T, options?: { encode?: Encode<T> }) => void;
 	};
 
 	export {};