diff --git a/test/test-cookie-param.v3.js b/test/test-cookie-param.v3.js
index c8e03ca..44b1f24 100644
--- a/test/test-cookie-param.v3.js
+++ b/test/test-cookie-param.v3.js
@@ -24,7 +24,7 @@ test("route registration succeeds with cookie param", (t, done) => {
 		serviceHandlers,
 	};
 
-	const fastify = Fastify(structuredClone(noStrict));
+	const fastify = Fastify(noStrict);
 	fastify.register(fastifyOpenapiGlue, opts);
 	fastify.ready((err) => {
 		if (err) {
@@ -43,7 +43,7 @@ test("route registration inserts cookie schema", (t, done) => {
 		addCookieSchema: true,
 	};
 
-	const fastify = Fastify(structuredClone(noStrict));
+	const fastify = Fastify(noStrict);
 	// Register onRoute handler which will be called when the plugin registers routes in the specification.
 	let hadCookieSchema = false;
 	fastify.addHook("onRoute", (routeOptions) => {
diff --git a/test/test-petstore-example.js b/test/test-petstore-example.js
index e84401a..5817cba 100644
--- a/test/test-petstore-example.js
+++ b/test/test-petstore-example.js
@@ -5,7 +5,7 @@ import Fastify from "fastify";
 import petstoreExample, { options } from "../examples/petstore/index.js";
 
 test("/v2/pet/24 works", async (t) => {
-	const fastify = Fastify(structuredClone(options));
+	const fastify = Fastify(options);
 	fastify.register(petstoreExample, {});
 	const res = await fastify.inject({
 		method: "GET",
@@ -23,7 +23,7 @@ test("/v2/pet/24 works", async (t) => {
 });
 
 test("/v2/pet/myPet returns Fastify validation error", async (t) => {
-	const fastify = Fastify(structuredClone(options));
+	const fastify = Fastify(options);
 	fastify.register(petstoreExample, {});
 	const res = await fastify.inject({
 		method: "GET",
@@ -37,7 +37,7 @@ test("/v2/pet/myPet returns Fastify validation error", async (t) => {
 });
 
 test("v2/pet/findByStatus?status=available&status=pending returns 'not implemented'", async (t) => {
-	const fastify = Fastify(structuredClone(options));
+	const fastify = Fastify(options);
 	fastify.register(petstoreExample, {});
 	const res = await fastify.inject({
 		method: "GET",
@@ -54,7 +54,7 @@ test("v2/pet/findByStatus?status=available&status=pending returns 'not implement
 });
 
 test("v2/pet/0 returns serialization error", async (t) => {
-	const fastify = Fastify(structuredClone(options));
+	const fastify = Fastify(options);
 	fastify.register(petstoreExample, {});
 	const res = await fastify.inject({
 		method: "GET",
diff --git a/test/test-plugin.v2.js b/test/test-plugin.v2.js
index 884584e..e768039 100644
--- a/test/test-plugin.v2.js
+++ b/test/test-plugin.v2.js
@@ -214,7 +214,7 @@ test("invalid service definition throws error ", (t, done) => {
 });
 
 test("full pet store V2 definition does not throw error ", (t, done) => {
-	const fastify = Fastify(structuredClone(noStrict));
+	const fastify = Fastify(noStrict);
 	fastify.register(fastifyOpenapiGlue, {
 		specification: structuredClone(petStoreSpec),
 		serviceHandlers,
@@ -292,7 +292,7 @@ test("generic path parameters override works", async (t) => {
 });
 
 test("schema attributes for non-body parameters work", async (t) => {
-	const fastify = Fastify(structuredClone(noStrict));
+	const fastify = Fastify(noStrict);
 	fastify.register(fastifyOpenapiGlue, {
 		specification: structuredClone(petStoreSpec),
 		serviceHandlers,
diff --git a/test/test-plugin.v3.js b/test/test-plugin.v3.js
index dce6282..c8ac682 100644
--- a/test/test-plugin.v3.js
+++ b/test/test-plugin.v3.js
@@ -248,7 +248,7 @@ test("response schema works with invalid response", async (t) => {
 });
 
 test("yaml spec works", async (t) => {
-	const fastify = Fastify(structuredClone(noStrict));
+	const fastify = Fastify(noStrict);
 	fastify.register(fastifyOpenapiGlue, yamlOpts);
 
 	const res = await fastify.inject({
@@ -315,7 +315,7 @@ test("missing service definition throws error ", (t, done) => {
 });
 
 test("full pet store V3 definition does not throw error ", (t, done) => {
-	const fastify = Fastify(structuredClone(noStrict));
+	const fastify = Fastify(noStrict);
 	// dummy parser to fix coverage testing
 	fastify.addContentTypeParser(
 		"application/xml",
@@ -341,7 +341,7 @@ test("V3.0.1 definition does not throw error", (t, done) => {
 		serviceHandlers,
 	};
 
-	const fastify = Fastify(structuredClone(noStrict));
+	const fastify = Fastify(noStrict);
 	fastify.register(fastifyOpenapiGlue, opts301);
 	fastify.ready((err) => {
 		if (err) {
@@ -361,7 +361,7 @@ test("V3.0.2 definition does not throw error", (t, done) => {
 		serviceHandlers,
 	};
 
-	const fastify = Fastify(structuredClone(noStrict));
+	const fastify = Fastify(noStrict);
 	fastify.register(fastifyOpenapiGlue, opts302);
 	fastify.ready((err) => {
 		if (err) {
@@ -381,7 +381,7 @@ test("V3.0.3 definition does not throw error", (t, done) => {
 		serviceHandlers,
 	};
 
-	const fastify = Fastify(structuredClone(noStrict));
+	const fastify = Fastify(noStrict);
 	fastify.register(fastifyOpenapiGlue, opts303);
 	fastify.ready((err) => {
 		if (err) {
diff --git a/test/test-recursive.v3.js b/test/test-recursive.v3.js
index 1eb3975..60cea40 100644
--- a/test/test-recursive.v3.js
+++ b/test/test-recursive.v3.js
@@ -24,7 +24,7 @@ test("route registration succeeds with recursion", (t, done) => {
 		serviceHandlers,
 	};
 
-	const fastify = Fastify(structuredClone(noStrict));
+	const fastify = Fastify(noStrict);
 	fastify.register(fastifyOpenapiGlue, opts);
 	fastify.ready((err) => {
 		if (err) {
diff --git a/test/test-securityHandlers.js b/test/test-securityHandlers.js
index e0053a1..73dbe1d 100644
--- a/test/test-securityHandlers.js
+++ b/test/test-securityHandlers.js
@@ -42,7 +42,7 @@ async function doTest(version, testSpecName, petStoreSpecName, prefix) {
 			securityHandlers,
 		};
 
-		const fastify = Fastify(structuredClone(noStrict));
+		const fastify = Fastify(noStrict);
 		fastify.register(fastifyOpenapiGlue, opts);
 		fastify.ready((err) => {
 			if (err) {