diff --git a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/factory/RequestHeaderSizeGatewayFilterFactory.java b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/factory/RequestHeaderSizeGatewayFilterFactory.java
index e5b8966c..33923e44 100644
--- a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/factory/RequestHeaderSizeGatewayFilterFactory.java
+++ b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/factory/RequestHeaderSizeGatewayFilterFactory.java
@@ -19,12 +19,18 @@ package org.springframework.cloud.gateway.filter.factory;
 import java.util.List;
 import java.util.Map;
 
+import reactor.core.publisher.Mono;
+
 import org.springframework.cloud.gateway.filter.GatewayFilter;
+import org.springframework.cloud.gateway.filter.GatewayFilterChain;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.server.reactive.ServerHttpRequest;
 import org.springframework.util.unit.DataSize;
 import org.springframework.util.unit.DataUnit;
+import org.springframework.web.server.ServerWebExchange;
+
+import static org.springframework.cloud.gateway.support.GatewayToStringStyler.filterToStringCreator;
 
 /**
  * This filter validates the size of each Request Header in the request. If size of any of
@@ -46,28 +52,37 @@ public class RequestHeaderSizeGatewayFilterFactory extends
 
 	@Override
 	public GatewayFilter apply(RequestHeaderSizeGatewayFilterFactory.Config config) {
-		return (exchange, chain) -> {
-			ServerHttpRequest request = exchange.getRequest();
-			HttpHeaders headers = request.getHeaders();
-			Long headerSizeInBytes = 0L;
+		return new GatewayFilter() {
+			@Override
+			public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
+				ServerHttpRequest request = exchange.getRequest();
+				HttpHeaders headers = request.getHeaders();
+				Long headerSizeInBytes = 0L;
 
-			for (Map.Entry<String, List<String>> headerEntry : headers.entrySet()) {
-				List<String> values = headerEntry.getValue();
-				for (String value : values) {
-					headerSizeInBytes += Long.valueOf(value.getBytes().length);
+				for (Map.Entry<String, List<String>> headerEntry : headers.entrySet()) {
+					List<String> values = headerEntry.getValue();
+					for (String value : values) {
+						headerSizeInBytes += Long.valueOf(value.getBytes().length);
+					}
 				}
+
+				if (headerSizeInBytes > config.getMaxSize().toBytes()) {
+					exchange.getResponse()
+							.setStatusCode(HttpStatus.REQUEST_HEADER_FIELDS_TOO_LARGE);
+					exchange.getResponse().getHeaders().add("errorMessage",
+							getErrorMessage(headerSizeInBytes, config.getMaxSize()));
+					return exchange.getResponse().setComplete();
+
+				}
+
+				return chain.filter(exchange);
 			}
 
-			if (headerSizeInBytes > config.getMaxSize().toBytes()) {
-				exchange.getResponse()
-						.setStatusCode(HttpStatus.REQUEST_HEADER_FIELDS_TOO_LARGE);
-				exchange.getResponse().getHeaders().add("errorMessage",
-						getErrorMessage(headerSizeInBytes, config.getMaxSize()));
-				return exchange.getResponse().setComplete();
-
+			@Override
+			public String toString() {
+				return filterToStringCreator(RequestHeaderSizeGatewayFilterFactory.this)
+						.append("max", config.getMaxSize()).toString();
 			}
-
-			return chain.filter(exchange);
 		};
 	}
 
diff --git a/spring-cloud-gateway-core/src/test/java/org/springframework/cloud/gateway/filter/factory/RequestHeaderSizeGatewayFilterFactoryTest.java b/spring-cloud-gateway-core/src/test/java/org/springframework/cloud/gateway/filter/factory/RequestHeaderSizeGatewayFilterFactoryTest.java
index de1338cd..f8a142b8 100644
--- a/spring-cloud-gateway-core/src/test/java/org/springframework/cloud/gateway/filter/factory/RequestHeaderSizeGatewayFilterFactoryTest.java
+++ b/spring-cloud-gateway-core/src/test/java/org/springframework/cloud/gateway/filter/factory/RequestHeaderSizeGatewayFilterFactoryTest.java
@@ -23,6 +23,8 @@ import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.SpringBootConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.cloud.gateway.filter.GatewayFilter;
+import org.springframework.cloud.gateway.filter.factory.RequestHeaderSizeGatewayFilterFactory.Config;
 import org.springframework.cloud.gateway.route.RouteLocator;
 import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
 import org.springframework.cloud.gateway.test.BaseWebClientTests;
@@ -34,6 +36,7 @@ import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.util.unit.DataSize;
 import org.springframework.util.unit.DataUnit;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
 
 /**
@@ -55,6 +58,14 @@ public class RequestHeaderSizeGatewayFilterFactoryTest extends BaseWebClientTest
 				.expectHeader().valueMatches("errorMessage", responseMesssage);
 	}
 
+	@Test
+	public void toStringFormat() {
+		Config config = new Config();
+		config.setMaxSize(DataSize.ofBytes(1000L));
+		GatewayFilter filter = new RequestHeaderSizeGatewayFilterFactory().apply(config);
+		assertThat(filter.toString()).contains("max").contains("1000B");
+	}
+
 	@EnableAutoConfiguration
 	@SpringBootConfiguration
 	@Import(DefaultTestConfig.class)