diff --git a/cas-client-core/src/main/java/org/jasig/cas/client/validation/Cas20ProxyReceivingTicketValidationFilter.java b/cas-client-core/src/main/java/org/jasig/cas/client/validation/Cas20ProxyReceivingTicketValidationFilter.java
index efe067a..75e529f 100644
--- a/cas-client-core/src/main/java/org/jasig/cas/client/validation/Cas20ProxyReceivingTicketValidationFilter.java
+++ b/cas-client-core/src/main/java/org/jasig/cas/client/validation/Cas20ProxyReceivingTicketValidationFilter.java
@@ -49,7 +49,7 @@ import org.jasig.cas.client.util.ReflectUtils;
  */
 public class Cas20ProxyReceivingTicketValidationFilter extends AbstractTicketValidationFilter {
 
-    private static final String[] RESERVED_INIT_PARAMS = new String[] {"proxyGrantingTicketStorageClass", "proxyReceptorUrl", "acceptAnyProxy", "allowedProxyChains", "casServerUrlPrefix", "proxyCallbackUrl", "renew", "exceptionOnValidationFailure", "redirectAfterValidation", "useSession", "serverName", "service", "artifactParameterName", "serviceParameterName", "encodeServiceUrl", "millisBetweenCleanUps"};
+    private static final String[] RESERVED_INIT_PARAMS = new String[] {"proxyGrantingTicketStorageClass", "proxyReceptorUrl", "acceptAnyProxy", "allowedProxyChains", "casServerUrlPrefix", "proxyCallbackUrl", "renew", "exceptionOnValidationFailure", "redirectAfterValidation", "useSession", "serverName", "service", "artifactParameterName", "serviceParameterName", "encodeServiceUrl", "millisBetweenCleanUps", "hostnameVerifier"};
 
     private static final int DEFAULT_MILLIS_BETWEEN_CLEANUPS = 60 * 1000;