diff --git a/config/src/main/java/org/springframework/security/config/http/DefaultFilterChainValidator.java b/config/src/main/java/org/springframework/security/config/http/DefaultFilterChainValidator.java
index eeee8efdaf..e242cc89b0 100644
--- a/config/src/main/java/org/springframework/security/config/http/DefaultFilterChainValidator.java
+++ b/config/src/main/java/org/springframework/security/config/http/DefaultFilterChainValidator.java
@@ -14,7 +14,7 @@ import org.springframework.security.web.FilterChainProxy;
 import org.springframework.security.web.FilterInvocation;
 import org.springframework.security.web.SecurityFilterChain;
 import org.springframework.security.web.access.ExceptionTranslationFilter;
-import org.springframework.security.web.access.intercept.DefaultFilterInvocationSecurityMetadataSource;
+import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
 import org.springframework.security.web.access.intercept.FilterSecurityInterceptor;
 import org.springframework.security.web.authentication.AnonymousAuthenticationFilter;
 import org.springframework.security.web.authentication.LoginUrlAuthenticationEntryPoint;
@@ -142,8 +142,8 @@ public class DefaultFilterChainValidator implements FilterChainProxy.FilterChain
         }
 
         FilterSecurityInterceptor fsi = getFilter(FilterSecurityInterceptor.class, filters);
-        DefaultFilterInvocationSecurityMetadataSource fids =
-                (DefaultFilterInvocationSecurityMetadataSource) fsi.getSecurityMetadataSource();
+        FilterInvocationSecurityMetadataSource fids =
+                fsi.getSecurityMetadataSource();
 
         Collection<ConfigAttribute> attributes = fids.getAttributes(loginRequest);
 
diff --git a/config/src/test/java/org/springframework/security/config/http/DefaultFilterChainValidatorTests.java b/config/src/test/java/org/springframework/security/config/http/DefaultFilterChainValidatorTests.java
index 1a05ad22e8..4eb705abac 100644
--- a/config/src/test/java/org/springframework/security/config/http/DefaultFilterChainValidatorTests.java
+++ b/config/src/test/java/org/springframework/security/config/http/DefaultFilterChainValidatorTests.java
@@ -15,6 +15,7 @@ package org.springframework.security.config.http;
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.anyObject;
 import static org.mockito.Mockito.doThrow;
+import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 
 import java.util.Collection;
@@ -33,6 +34,7 @@ import org.springframework.security.web.DefaultSecurityFilterChain;
 import org.springframework.security.web.FilterChainProxy;
 import org.springframework.security.web.access.ExceptionTranslationFilter;
 import org.springframework.security.web.access.intercept.DefaultFilterInvocationSecurityMetadataSource;
+import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
 import org.springframework.security.web.access.intercept.FilterSecurityInterceptor;
 import org.springframework.security.web.authentication.AnonymousAuthenticationFilter;
 import org.springframework.security.web.authentication.LoginUrlAuthenticationEntryPoint;
@@ -53,15 +55,17 @@ public class DefaultFilterChainValidatorTests {
     @Mock
     private AccessDecisionManager accessDecisionManager;
 
+    private FilterSecurityInterceptor fsi;
+
     @Before
     public void setUp() throws Exception {
         AnonymousAuthenticationFilter aaf = new AnonymousAuthenticationFilter("anonymous");
-        FilterSecurityInterceptor fsi = new FilterSecurityInterceptor();
+        fsi = new FilterSecurityInterceptor();
         fsi.setAccessDecisionManager(accessDecisionManager);
         fsi.setSecurityMetadataSource(metadataSource);
         AuthenticationEntryPoint authenticationEntryPoint = new LoginUrlAuthenticationEntryPoint("/login");
         ExceptionTranslationFilter etf = new ExceptionTranslationFilter(authenticationEntryPoint);
-        DefaultSecurityFilterChain securityChain = new DefaultSecurityFilterChain(new AnyRequestMatcher(),aaf,etf,fsi);
+        DefaultSecurityFilterChain securityChain = new DefaultSecurityFilterChain(new AnyRequestMatcher(), aaf, etf, fsi);
         fcp = new FilterChainProxy(securityChain);
         validator = new DefaultFilterChainValidator();
         Whitebox.setInternalState(validator, "logger", logger);
@@ -77,4 +81,14 @@ public class DefaultFilterChainValidatorTests {
         verify(logger).info("Unable to check access to the login page to determine if anonymous access is allowed. This might be an error, but can happen under normal circumstances.", toBeThrown);
     }
 
+    // SEC-1957
+    @Test
+    public void validateCustomMetadataSource() {
+        FilterInvocationSecurityMetadataSource customMetaDataSource = mock(FilterInvocationSecurityMetadataSource.class);
+        fsi.setSecurityMetadataSource(customMetaDataSource);
+
+        validator.validate(fcp);
+
+        verify(customMetaDataSource).getAttributes(any());
+    }
 }