diff --git a/cas-client-core/src/main/java/org/jasig/cas/client/authentication/AttributePrincipalImpl.java b/cas-client-core/src/main/java/org/jasig/cas/client/authentication/AttributePrincipalImpl.java
index 96c5a22..2ac1cba 100644
--- a/cas-client-core/src/main/java/org/jasig/cas/client/authentication/AttributePrincipalImpl.java
+++ b/cas-client-core/src/main/java/org/jasig/cas/client/authentication/AttributePrincipalImpl.java
@@ -13,9 +13,12 @@ import java.util.Map;
  * @version $Revision$ $Date$
  * @since 3.1
  */
-public class AttributePrincipalImpl implements AttributePrincipal{
+public class AttributePrincipalImpl implements AttributePrincipal {
 
-    /** The unique identifier for this principal. */
+    /** Unique Id for Serialization */
+	private static final long serialVersionUID = -8810123156070148535L;
+
+	/** The unique identifier for this principal. */
     private final String name;
 
     /** Map of key/value pairs about this principal. */
diff --git a/cas-client-core/src/main/java/org/jasig/cas/client/validation/AssertionImpl.java b/cas-client-core/src/main/java/org/jasig/cas/client/validation/AssertionImpl.java
index a956fc8..cc5ed8c 100644
--- a/cas-client-core/src/main/java/org/jasig/cas/client/validation/AssertionImpl.java
+++ b/cas-client-core/src/main/java/org/jasig/cas/client/validation/AssertionImpl.java
@@ -18,7 +18,10 @@ import java.util.Map;
  */
 public final class AssertionImpl implements Assertion {
 
-    /** The date from which the assertion is valid. */
+    /** Unique Id for serialization. */
+	private static final long serialVersionUID = -7767943925833639221L;
+
+	/** The date from which the assertion is valid. */
     private final Date validFromDate;
 
     /** The date the assertion is valid until. */