diff --git a/spring-security-mvc-boot/src/main/java/org/baeldung/config/SecurityConfig.java b/spring-security-mvc-boot/src/main/java/org/baeldung/config/SecurityConfig.java
index 8cc9d45823..acb7e6820a 100644
--- a/spring-security-mvc-boot/src/main/java/org/baeldung/config/SecurityConfig.java
+++ b/spring-security-mvc-boot/src/main/java/org/baeldung/config/SecurityConfig.java
@@ -24,7 +24,7 @@ public class SecurityConfig extends WebSecurityConfigurerAdapter {
 
     @Override
     protected void configure(final AuthenticationManagerBuilder auth) throws Exception {
-        auth.userDetailsService(userDetailsService);
+        auth.authenticationProvider(authenticationProvider());
     }
 
     @Override