diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/servlet/UserDetailsServiceAutoConfiguration.java b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/servlet/UserDetailsServiceAutoConfiguration.java
index d7e70ed371..6d5d4b08b3 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/servlet/UserDetailsServiceAutoConfiguration.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/servlet/UserDetailsServiceAutoConfiguration.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -61,7 +61,8 @@ import org.springframework.util.StringUtils;
 				AuthenticationManagerResolver.class },
 		type = { "org.springframework.security.oauth2.jwt.JwtDecoder",
 				"org.springframework.security.oauth2.server.resource.introspection.OpaqueTokenIntrospector",
-				"org.springframework.security.oauth2.client.registration.ClientRegistrationRepository" })
+				"org.springframework.security.oauth2.client.registration.ClientRegistrationRepository",
+				"org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository" })
 public class UserDetailsServiceAutoConfiguration {
 
 	private static final String NOOP_PASSWORD_PREFIX = "{noop}";
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/servlet/UserDetailsServiceAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/servlet/UserDetailsServiceAutoConfigurationTests.java
index 96a00518ad..2ae8c294b3 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/servlet/UserDetailsServiceAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/servlet/UserDetailsServiceAutoConfigurationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -46,6 +46,7 @@ import org.springframework.security.oauth2.client.registration.ClientRegistratio
 import org.springframework.security.oauth2.jwt.JwtDecoder;
 import org.springframework.security.oauth2.server.resource.introspection.OpaqueTokenIntrospector;
 import org.springframework.security.provisioning.InMemoryUserDetailsManager;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.Mockito.mock;
@@ -156,6 +157,14 @@ class UserDetailsServiceAutoConfigurationTests {
 				.run(((context) -> assertThat(context).doesNotHaveBean(InMemoryUserDetailsManager.class)));
 	}
 
+	@Test
+	void userDetailsServiceWhenRelyingPartyRegistrationRepositoryBeanPresent() {
+		this.contextRunner
+				.withBean(RelyingPartyRegistrationRepository.class,
+						() -> mock(RelyingPartyRegistrationRepository.class))
+				.run(((context) -> assertThat(context).doesNotHaveBean(InMemoryUserDetailsManager.class)));
+	}
+
 	@Test
 	void generatedPasswordShouldNotBePrintedIfAuthenticationManagerBuilderIsUsed(CapturedOutput output) {
 		this.contextRunner.withUserConfiguration(TestConfigWithAuthenticationManagerBuilder.class)