diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultAsyncServerResponse.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultAsyncServerResponse.java
index 065745bec96..1ba7faf03cc 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultAsyncServerResponse.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultAsyncServerResponse.java
@@ -115,8 +115,11 @@ final class DefaultAsyncServerResponse extends ErrorHandlingServerResponse imple
 			throws ServletException, IOException {
 
 		WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);
-		AsyncWebRequest asyncWebRequest = WebAsyncUtils.createAsyncWebRequest(request, response);
-		asyncManager.setAsyncWebRequest(asyncWebRequest);
+		AsyncWebRequest asyncWebRequest = asyncManager.getAsyncWebRequest();
+		if (asyncWebRequest == null) {
+			asyncWebRequest = WebAsyncUtils.createAsyncWebRequest(request, response);
+			asyncManager.setAsyncWebRequest(asyncWebRequest);
+		}
 		try {
 			asyncManager.startDeferredResultProcessing(deferredResult);
 		}
diff --git a/spring-webmvc/src/test/java/org/springframework/web/servlet/function/DefaultAsyncServerResponseTests.java b/spring-webmvc/src/test/java/org/springframework/web/servlet/function/DefaultAsyncServerResponseTests.java
index 1a4d53b92f1..b0fead91860 100644
--- a/spring-webmvc/src/test/java/org/springframework/web/servlet/function/DefaultAsyncServerResponseTests.java
+++ b/spring-webmvc/src/test/java/org/springframework/web/servlet/function/DefaultAsyncServerResponseTests.java
@@ -18,15 +18,43 @@ package org.springframework.web.servlet.function;
 
 import java.util.concurrent.CompletableFuture;
 
+import jakarta.servlet.AsyncContext;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.web.context.request.async.AsyncWebRequest;
+import org.springframework.web.context.request.async.DeferredResult;
+import org.springframework.web.context.request.async.WebAsyncManager;
+import org.springframework.web.context.request.async.WebAsyncUtils;
+import org.springframework.web.testfixture.servlet.MockHttpServletRequest;
+import org.springframework.web.testfixture.servlet.MockHttpServletResponse;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
+ * Tests for {@link DefaultAsyncServerResponse}.
  * @author Arjen Poutsma
  */
 class DefaultAsyncServerResponseTests {
 
+	@Test
+	void writeAsyncReusesExistingAsyncWebRequestTimeout() throws Exception {
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/");
+		request.setAsyncSupported(true);
+		MockHttpServletResponse response = new MockHttpServletResponse();
+
+		AsyncWebRequest existingAsyncWebRequest = WebAsyncUtils.createAsyncWebRequest(request, response);
+		existingAsyncWebRequest.setTimeout(1000L);
+		WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);
+		asyncManager.setAsyncWebRequest(existingAsyncWebRequest);
+
+		DeferredResult<Object> deferredResult = new DeferredResult<>();
+		DefaultAsyncServerResponse.writeAsync(request, response, deferredResult);
+
+		assertThat(asyncManager.getAsyncWebRequest()).isSameAs(existingAsyncWebRequest);
+		AsyncContext asyncContext = request.getAsyncContext();
+		assertThat(asyncContext.getTimeout()).isEqualTo(1000L);
+	}
+
 	@Test
 	void blockCompleted() {
 		ServerResponse wrappee = ServerResponse.ok().build();