diff --git a/packages/kit/src/runtime/server/cookie.js b/packages/kit/src/runtime/server/cookie.js
index ddefa847a432..7c854056d383 100644
--- a/packages/kit/src/runtime/server/cookie.js
+++ b/packages/kit/src/runtime/server/cookie.js
@@ -67,8 +67,8 @@ export function get_cookies(request, url, trailing_slash) {
 				return c.value;
 			}
 
-			const decoder = opts?.decode || decodeURIComponent;
-			const req_cookies = parse(header, { decode: decoder });
+			// `parse` uses default decoder if `opts.decode` is undefined
+			const req_cookies = parse(header, { decode: opts?.decode });
 			const cookie = req_cookies[name]; // the decoded string or undefined
 
 			// in development, if the cookie was set during this session with `cookies.set`,
@@ -95,8 +95,8 @@ export function get_cookies(request, url, trailing_slash) {
 		 * @param {import('cookie').CookieParseOptions} opts
 		 */
 		getAll(opts) {
-			const decoder = opts?.decode || decodeURIComponent;
-			const cookies = parse(header, { decode: decoder });
+			// `parse` uses default decoder if `opts.decode` is undefined
+			const cookies = parse(header, { decode: opts?.decode });
 
 			for (const c of Object.values(new_cookies)) {
 				if (