diff --git a/source/core/Ky.ts b/source/core/Ky.ts
index 673e7e85..2b816bbd 100644
--- a/source/core/Ky.ts
+++ b/source/core/Ky.ts
@@ -295,7 +295,7 @@ export class Ky {
 			}
 		}
 
-		const nonRequestOptions = findUnknownOptions(this.request, this._options);
+		const nonRequestOptions = findUnknownOptions(this._options);
 
 		if (this._options.timeout === false) {
 			return this._options.fetch(this.request.clone(), nonRequestOptions);
diff --git a/source/utils/options.ts b/source/utils/options.ts
index 4968f2bf..272f3f06 100644
--- a/source/utils/options.ts
+++ b/source/utils/options.ts
@@ -1,13 +1,12 @@
 import {kyOptionKeys, requestOptionsRegistry} from '../core/constants.js';
 
 export const findUnknownOptions = (
-	request: Request,
 	options: Record<string, unknown>,
 ): Record<string, unknown> => {
 	const unknownOptions: Record<string, unknown> = {};
 
 	for (const key in options) {
-		if (!(key in requestOptionsRegistry) && !(key in kyOptionKeys) && !(key in request)) {
+		if (!(key in requestOptionsRegistry) && !(key in kyOptionKeys)) {
 			unknownOptions[key] = options[key];
 		}
 	}