diff --git a/spring-web/src/main/java/org/springframework/http/server/reactive/ServletHttpHandlerAdapter.java b/spring-web/src/main/java/org/springframework/http/server/reactive/ServletHttpHandlerAdapter.java
index 093076710b..e16a4b6287 100644
--- a/spring-web/src/main/java/org/springframework/http/server/reactive/ServletHttpHandlerAdapter.java
+++ b/spring-web/src/main/java/org/springframework/http/server/reactive/ServletHttpHandlerAdapter.java
@@ -210,7 +210,7 @@ public class ServletHttpHandlerAdapter implements Servlet {
 	protected ServletServerHttpResponse createResponse(HttpServletResponse response,
 			AsyncContext context, ServletServerHttpRequest request) throws IOException {
 
-		return new ServletServerHttpResponse(response, context, getDataBufferFactory(), getBufferSize(), request);
+		return new ServletServerHttpResponse(response, context, getDataBufferFactory(), request);
 	}
 
 	@Override
diff --git a/spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpResponse.java b/spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpResponse.java
index ac145a04d4..ccaf9b5733 100644
--- a/spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpResponse.java
+++ b/spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpResponse.java
@@ -54,8 +54,6 @@ class ServletServerHttpResponse extends AbstractListenerServerHttpResponse {
 
 	private final ServletOutputStream outputStream;
 
-	private final int bufferSize;
-
 	@Nullable
 	private volatile ResponseBodyFlushProcessor bodyFlushProcessor;
 
@@ -70,23 +68,21 @@ class ServletServerHttpResponse extends AbstractListenerServerHttpResponse {
 
 
 	public ServletServerHttpResponse(HttpServletResponse response, AsyncContext asyncContext,
-			DataBufferFactory bufferFactory, int bufferSize, ServletServerHttpRequest request) throws IOException {
+			DataBufferFactory bufferFactory, ServletServerHttpRequest request) throws IOException {
 
-		this(new HttpHeaders(), response, asyncContext, bufferFactory, bufferSize, request);
+		this(new HttpHeaders(), response, asyncContext, bufferFactory, request);
 	}
 
 	public ServletServerHttpResponse(HttpHeaders headers, HttpServletResponse response, AsyncContext asyncContext,
-			DataBufferFactory bufferFactory, int bufferSize, ServletServerHttpRequest request) throws IOException {
+			DataBufferFactory bufferFactory, ServletServerHttpRequest request) throws IOException {
 
 		super(bufferFactory, headers);
 
 		Assert.notNull(response, "HttpServletResponse must not be null");
 		Assert.notNull(bufferFactory, "DataBufferFactory must not be null");
-		Assert.isTrue(bufferSize > 0, "Buffer size must be greater than 0");
 
 		this.response = response;
 		this.outputStream = response.getOutputStream();
-		this.bufferSize = bufferSize;
 		this.request = request;
 
 		this.asyncListener = new ResponseAsyncListener();
diff --git a/spring-web/src/main/java/org/springframework/http/server/reactive/TomcatHttpHandlerAdapter.java b/spring-web/src/main/java/org/springframework/http/server/reactive/TomcatHttpHandlerAdapter.java
index 20064837c7..aaae97ba03 100644
--- a/spring-web/src/main/java/org/springframework/http/server/reactive/TomcatHttpHandlerAdapter.java
+++ b/spring-web/src/main/java/org/springframework/http/server/reactive/TomcatHttpHandlerAdapter.java
@@ -69,7 +69,7 @@ public class TomcatHttpHandlerAdapter extends ServletHttpHandlerAdapter {
 			AsyncContext asyncContext, ServletServerHttpRequest request) throws IOException {
 
 		return new TomcatServerHttpResponse(
-				response, asyncContext, getDataBufferFactory(), getBufferSize(), request);
+				response, asyncContext, getDataBufferFactory(), request);
 	}
 
 
@@ -129,9 +129,9 @@ public class TomcatHttpHandlerAdapter extends ServletHttpHandlerAdapter {
 		}
 
 		TomcatServerHttpResponse(HttpServletResponse response, AsyncContext context,
-				DataBufferFactory factory, int bufferSize, ServletServerHttpRequest request) throws IOException {
+				DataBufferFactory factory, ServletServerHttpRequest request) throws IOException {
 
-			super(createTomcatHttpHeaders(response), response, context, factory, bufferSize, request);
+			super(createTomcatHttpHeaders(response), response, context, factory, request);
 		}
 
 		private static HttpHeaders createTomcatHttpHeaders(HttpServletResponse response) {