diff --git a/spring-test/src/main/java/org/springframework/test/web/reactive/server/DefaultWebTestClientBuilder.java b/spring-test/src/main/java/org/springframework/test/web/reactive/server/DefaultWebTestClientBuilder.java
index 719012d8f4d..e4b46ba4419 100644
--- a/spring-test/src/main/java/org/springframework/test/web/reactive/server/DefaultWebTestClientBuilder.java
+++ b/spring-test/src/main/java/org/springframework/test/web/reactive/server/DefaultWebTestClientBuilder.java
@@ -67,7 +67,8 @@ class DefaultWebTestClientBuilder implements WebTestClient.Builder {
 	static {
 		ClassLoader loader = DefaultWebTestClientBuilder.class.getClassLoader();
 		REACTOR_NETTY_CLIENT_PRESENT = ClassUtils.isPresent("reactor.netty.http.client.HttpClient", loader);
-		JETTY_CLIENT_PRESENT = ClassUtils.isPresent("org.eclipse.jetty.client.HttpClient", loader);
+		JETTY_CLIENT_PRESENT = ClassUtils.isPresent("org.eclipse.jetty.client.HttpClient", loader) &&
+				ClassUtils.isPresent("org.eclipse.jetty.reactive.client.ReactiveRequest", loader);
 		HTTP_COMPONENTS_CLIENT_PRESENT =
 				ClassUtils.isPresent("org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient", loader) &&
 						ClassUtils.isPresent("org.apache.hc.core5.reactive.ReactiveDataConsumer", loader);
diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultWebClientBuilder.java b/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultWebClientBuilder.java
index bbab8fea18d..d9ce191706a 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultWebClientBuilder.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultWebClientBuilder.java
@@ -64,7 +64,8 @@ final class DefaultWebClientBuilder implements WebClient.Builder {
 	static {
 		ClassLoader loader = DefaultWebClientBuilder.class.getClassLoader();
 		REACTOR_NETTY_CLIENT_PRESENT = ClassUtils.isPresent("reactor.netty.http.client.HttpClient", loader);
-		JETTY_CLIENT_PRESENT = ClassUtils.isPresent("org.eclipse.jetty.client.HttpClient", loader);
+		JETTY_CLIENT_PRESENT = ClassUtils.isPresent("org.eclipse.jetty.client.HttpClient", loader) &&
+				ClassUtils.isPresent("org.eclipse.jetty.reactive.client.ReactiveRequest", loader);
 		HTTP_COMPONENTS_CLIENT_PRESENT =
 				ClassUtils.isPresent("org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient", loader) &&
 						ClassUtils.isPresent("org.apache.hc.core5.reactive.ReactiveDataConsumer", loader);