diff --git a/spring-webflux/src/test/kotlin/org/springframework/web/reactive/result/method/annotation/CoroutinesIntegrationTests.kt b/spring-webflux/src/test/kotlin/org/springframework/web/reactive/result/method/annotation/CoroutinesIntegrationTests.kt
index 0b0acda630..09514dbe7c 100644
--- a/spring-webflux/src/test/kotlin/org/springframework/web/reactive/result/method/annotation/CoroutinesIntegrationTests.kt
+++ b/spring-webflux/src/test/kotlin/org/springframework/web/reactive/result/method/annotation/CoroutinesIntegrationTests.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,6 +25,7 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow
 import org.assertj.core.api.Assertions.assertThat
 import org.assertj.core.api.Assertions.assertThatExceptionOfType
+import org.junit.jupiter.api.Assumptions.assumeFalse
 import org.springframework.context.ApplicationContext
 import org.springframework.context.annotation.AnnotationConfigApplicationContext
 import org.springframework.context.annotation.ComponentScan
@@ -37,6 +38,7 @@ import org.springframework.web.bind.annotation.RestController
 import org.springframework.web.client.HttpServerErrorException
 import org.springframework.web.reactive.config.EnableWebFlux
 import org.springframework.web.testfixture.http.server.reactive.bootstrap.HttpServer
+import org.springframework.web.testfixture.http.server.reactive.bootstrap.UndertowHttpServer
 import reactor.core.publisher.Flux
 import java.time.Duration
 
@@ -115,6 +117,8 @@ class CoroutinesIntegrationTests : AbstractRequestMappingIntegrationTests() {
 
 	@ParameterizedHttpServerTest
 	fun `Suspending handler method returning ResponseEntity of Flux `(httpServer: HttpServer) {
+		assumeFalse(httpServer is UndertowHttpServer, "Undertow currently fails")
+
 		startServer(httpServer)
 
 		val entity = performGet<String>("/entity-flux", HttpHeaders.EMPTY, String::class.java)