diff --git a/cas-client-core/src/main/java/org/jasig/cas/client/proxy/Cas20ProxyRetriever.java b/cas-client-core/src/main/java/org/jasig/cas/client/proxy/Cas20ProxyRetriever.java
index cd285a0..7b5450a 100644
--- a/cas-client-core/src/main/java/org/jasig/cas/client/proxy/Cas20ProxyRetriever.java
+++ b/cas-client-core/src/main/java/org/jasig/cas/client/proxy/Cas20ProxyRetriever.java
@@ -32,7 +32,10 @@ import java.net.URLEncoder;
  */
 public final class Cas20ProxyRetriever implements ProxyRetriever {
 
-    /**
+    /** Unique Id for serialization. */
+	private static final long serialVersionUID = 560409469568911791L;
+
+	/**
      * Instance of Commons Logging.
      */
     private final Log log = LogFactory.getLog(this.getClass());
diff --git a/cas-client-core/src/test/java/org/jasig/cas/client/validation/Cas20ProxyTicketValidatorTests.java b/cas-client-core/src/test/java/org/jasig/cas/client/validation/Cas20ProxyTicketValidatorTests.java
index aa0f057..64ed3e4 100644
--- a/cas-client-core/src/test/java/org/jasig/cas/client/validation/Cas20ProxyTicketValidatorTests.java
+++ b/cas-client-core/src/test/java/org/jasig/cas/client/validation/Cas20ProxyTicketValidatorTests.java
@@ -53,7 +53,10 @@ public final class Cas20ProxyTicketValidatorTests extends
     private ProxyRetriever getProxyRetriever() {
         final ProxyRetriever proxyRetriever = new ProxyRetriever() {
 
-            public String getProxyTicketIdFor(String proxyGrantingTicketId, String targetService) {
+            /** Unique Id For serialization. */
+			private static final long serialVersionUID = 1L;
+
+			public String getProxyTicketIdFor(String proxyGrantingTicketId, String targetService) {
                 return "test";
             }
         };
diff --git a/cas-client-core/src/test/java/org/jasig/cas/client/validation/Cas20ServiceTicketValidatorTests.java b/cas-client-core/src/test/java/org/jasig/cas/client/validation/Cas20ServiceTicketValidatorTests.java
index c8386e8..03211e9 100644
--- a/cas-client-core/src/test/java/org/jasig/cas/client/validation/Cas20ServiceTicketValidatorTests.java
+++ b/cas-client-core/src/test/java/org/jasig/cas/client/validation/Cas20ServiceTicketValidatorTests.java
@@ -53,7 +53,10 @@ public final class Cas20ServiceTicketValidatorTests extends
     private ProxyRetriever getProxyRetriever() {
         final ProxyRetriever proxyRetriever = new ProxyRetriever() {
 
-            public String getProxyTicketIdFor(String proxyGrantingTicketId, String targetService) {
+            /** Unique Id for serialization. */
+			private static final long serialVersionUID = 1L;
+
+			public String getProxyTicketIdFor(String proxyGrantingTicketId, String targetService) {
                 return "test";
             }
         };