diff --git a/core/src/main/java/org/springframework/security/AuthenticationException.java b/core/src/main/java/org/springframework/security/AuthenticationException.java
index 07cf1fa73b..026ff1e9be 100644
--- a/core/src/main/java/org/springframework/security/AuthenticationException.java
+++ b/core/src/main/java/org/springframework/security/AuthenticationException.java
@@ -26,7 +26,7 @@ public abstract class AuthenticationException extends SpringSecurityException {
     //~ Instance fields ================================================================================================
 
     private Authentication authentication;
-    private Object extraInformation;
+    private transient Object extraInformation;
 
     //~ Constructors ===================================================================================================