diff --git a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/AuthenticationManagerConfiguration.java b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/AuthenticationManagerConfiguration.java
index ee609d11b1f..08b01c2261b 100644
--- a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/AuthenticationManagerConfiguration.java
+++ b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/AuthenticationManagerConfiguration.java
@@ -207,7 +207,7 @@ public class AuthenticationManagerConfiguration extends
 		@Override
 		public Authentication authenticate(Authentication authentication)
 				throws AuthenticationException {
-			return builder.getOrBuild().authenticate(authentication);
+			return this.builder.getOrBuild().authenticate(authentication);
 		}
 
 	}
diff --git a/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/SecurityAutoConfigurationTests.java b/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/SecurityAutoConfigurationTests.java
index 179aeb6703a..ed2b18a7117 100644
--- a/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/SecurityAutoConfigurationTests.java
+++ b/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/SecurityAutoConfigurationTests.java
@@ -16,11 +16,6 @@
 
 package org.springframework.boot.autoconfigure.security;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
-
 import java.util.List;
 import java.util.concurrent.atomic.AtomicReference;
 
@@ -57,6 +52,11 @@ import org.springframework.security.web.FilterChainProxy;
 import org.springframework.security.web.SecurityFilterChain;
 import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
 /**
  * Tests for {@link SecurityAutoConfiguration}.
  *