diff --git a/spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/config/GatewayReactiveOAuth2AutoConfiguration.java b/spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/config/GatewayReactiveOAuth2AutoConfiguration.java
index 45ecb48c..76f454b2 100644
--- a/spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/config/GatewayReactiveOAuth2AutoConfiguration.java
+++ b/spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/config/GatewayReactiveOAuth2AutoConfiguration.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2020 the original author or authors.
+ * Copyright 2013-2021 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.
@@ -19,6 +19,7 @@ package org.springframework.cloud.gateway.config;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.security.SecurityProperties;
 import org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration;
@@ -43,6 +44,7 @@ import org.springframework.security.web.server.SecurityWebFilterChain;
 public class GatewayReactiveOAuth2AutoConfiguration {
 
 	@Bean
+	@ConditionalOnMissingBean
 	@ConditionalOnBean(ReactiveClientRegistrationRepository.class)
 	public ReactiveOAuth2AuthorizedClientManager gatewayReactiveOAuth2AuthorizedClientManager(
 			ReactiveClientRegistrationRepository clientRegistrationRepository,
diff --git a/spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/config/GatewayAutoConfigurationTests.java b/spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/config/GatewayAutoConfigurationTests.java
index 32a3a5df..1da2f947 100644
--- a/spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/config/GatewayAutoConfigurationTests.java
+++ b/spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/config/GatewayAutoConfigurationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2020 the original author or authors.
+ * Copyright 2013-2021 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.
@@ -225,6 +225,25 @@ public class GatewayAutoConfigurationTests {
 				});
 	}
 
+	@Test
+	public void gatewayReactiveOAuth2AuthorizedClientManagerBacksOffForCustomBean() {
+		new ReactiveWebApplicationContextRunner()
+				.withConfiguration(AutoConfigurations.of(ReactiveSecurityAutoConfiguration.class,
+						ReactiveOAuth2ClientAutoConfiguration.class, GatewayReactiveOAuth2AutoConfiguration.class))
+				.withUserConfiguration(TestReactiveOAuth2AuthorizedClientManagerConfig.class)
+				.withPropertyValues(
+						"spring.security.oauth2.client.provider[testprovider].authorization-uri=http://localhost",
+						"spring.security.oauth2.client.provider[testprovider].token-uri=http://localhost/token",
+						"spring.security.oauth2.client.registration[test].provider=testprovider",
+						"spring.security.oauth2.client.registration[test].authorization-grant-type=authorization_code",
+						"spring.security.oauth2.client.registration[test].redirect-uri=http://localhost/redirect",
+						"spring.security.oauth2.client.registration[test].client-id=login-client")
+				.run(context -> {
+					assertThat(context).hasSingleBean(ReactiveOAuth2AuthorizedClientManager.class);
+					assertThat(context).hasBean("myReactiveOAuth2AuthorizedClientManager");
+				});
+	}
+
 	@Test
 	public void noTokenRelayFilter() {
 		assertThatThrownBy(() -> {
@@ -558,4 +577,14 @@ public class GatewayAutoConfigurationTests {
 
 	}
 
+	@Configuration
+	protected static class TestReactiveOAuth2AuthorizedClientManagerConfig {
+
+		@Bean
+		ReactiveOAuth2AuthorizedClientManager myReactiveOAuth2AuthorizedClientManager() {
+			return authorizeRequest -> null;
+		}
+
+	}
+
 }