diff --git a/model/api/src/main/java/org/keycloak/models/UserCredentialValueModel.java b/model/api/src/main/java/org/keycloak/models/UserCredentialValueModel.java
index 4654ba5b60..988f6a62f7 100755
--- a/model/api/src/main/java/org/keycloak/models/UserCredentialValueModel.java
+++ b/model/api/src/main/java/org/keycloak/models/UserCredentialValueModel.java
@@ -1,11 +1,13 @@
 package org.keycloak.models;
 
+import java.io.Serializable;
+
 /**
  * Used just in cases when we want to "directly" update or retrieve the hash or salt of user credential (For example during export/import)
  *
  * @author <a href="mailto:mposolda@redhat.com">Marek Posolda</a>
  */
-public class UserCredentialValueModel {
+public class UserCredentialValueModel implements Serializable {
 
     private String type;
     private String value;
diff --git a/model/invalidation-cache/model-adapters/src/main/java/org/keycloak/models/cache/entities/CachedUser.java b/model/invalidation-cache/model-adapters/src/main/java/org/keycloak/models/cache/entities/CachedUser.java
index eb9d418cb7..bbef81b759 100755
--- a/model/invalidation-cache/model-adapters/src/main/java/org/keycloak/models/cache/entities/CachedUser.java
+++ b/model/invalidation-cache/model-adapters/src/main/java/org/keycloak/models/cache/entities/CachedUser.java
@@ -5,6 +5,7 @@ import org.keycloak.models.RoleModel;
 import org.keycloak.models.UserCredentialValueModel;
 import org.keycloak.models.UserModel;
 
+import java.io.Serializable;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedList;
@@ -16,7 +17,7 @@ import java.util.Set;
  * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
  * @version $Revision: 1 $
  */
-public class CachedUser {
+public class CachedUser implements Serializable {
     private String id;
     private String realm;
     private String username;