diff --git a/spring-web/src/main/java/org/springframework/http/client/reactive/JettyClientHttpResponse.java b/spring-web/src/main/java/org/springframework/http/client/reactive/JettyClientHttpResponse.java
index 0a7d87281a..a41d18984f 100644
--- a/spring-web/src/main/java/org/springframework/http/client/reactive/JettyClientHttpResponse.java
+++ b/spring-web/src/main/java/org/springframework/http/client/reactive/JettyClientHttpResponse.java
@@ -33,7 +33,6 @@ import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseCookie;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
-import org.springframework.util.ClassUtils;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
@@ -53,8 +52,7 @@ class JettyClientHttpResponse implements ClientHttpResponse {
 
 	private static final ClassLoader loader = JettyClientHttpResponse.class.getClassLoader();
 
-	private static final boolean jetty10Present = ClassUtils.isPresent(
-			"org.eclipse.jetty.websocket.server.JettyWebSocketServerContainer", loader);
+	private static final boolean jetty10Present;
 
 
 	private final ReactiveResponse reactiveResponse;
@@ -64,6 +62,17 @@ class JettyClientHttpResponse implements ClientHttpResponse {
 	private final HttpHeaders headers;
 
 
+	static {
+		try {
+			Class<?> httpFieldsClass = loader.loadClass("org.eclipse.jetty.http.HttpFields");
+			jetty10Present = httpFieldsClass.isInterface();
+		}
+		catch (ClassNotFoundException ex) {
+			throw new IllegalStateException("No compatible Jetty version found", ex);
+		}
+	}
+
+
 	public JettyClientHttpResponse(ReactiveResponse reactiveResponse, Publisher<DataBuffer> content) {
 		this.reactiveResponse = reactiveResponse;
 		this.content = Flux.from(content);