diff --git a/libreplan-business/src/main/java/org/libreplan/business/users/entities/User.java b/libreplan-business/src/main/java/org/libreplan/business/users/entities/User.java
index 16ebd4fa7..fa435b46a 100644
--- a/libreplan-business/src/main/java/org/libreplan/business/users/entities/User.java
+++ b/libreplan-business/src/main/java/org/libreplan/business/users/entities/User.java
@@ -317,4 +317,8 @@ public class User extends BaseEntity implements IHumanIdentifiable{
         return firstName + " " + lastName;
     }
 
+    public boolean isBound() {
+        return worker != null;
+    }
+
 }
diff --git a/libreplan-webapp/src/main/webapp/users/_editUser.zul b/libreplan-webapp/src/main/webapp/users/_editUser.zul
index 3c6703395..37522dc40 100644
--- a/libreplan-webapp/src/main/webapp/users/_editUser.zul
+++ b/libreplan-webapp/src/main/webapp/users/_editUser.zul
@@ -2,7 +2,8 @@
     This file is part of LibrePlan
 
     Copyright (C) 2009-2010 Fundación para o Fomento da Calidade Industrial e
-    Desenvolvemento Tecnolóxico de Galicia
+                            Desenvolvemento Tecnolóxico de Galicia
+    Copyright (C) 2010-2012 Igalia, S.L.
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU Affero General Public License as published by
@@ -53,12 +54,14 @@
                             <row>
                                 <label value="${i18n:_('First name')}" />
                                 <textbox id="firstName"
-                                    value="@{controller.user.firstName}" width="300px"/>
+                                    value="@{controller.user.firstName}" width="300px"
+                                    disabled="@{controller.user.bound}" />
                             </row>
                             <row>
                                 <label value="${i18n:_('Last name')}" />
                                 <textbox id="lastName"
-                                    value="@{controller.user.lastName}" width="300px"/>
+                                    value="@{controller.user.lastName}" width="300px"
+                                    disabled="@{controller.user.bound}" />
                             </row>
                             <row>
                                 <label value="${i18n:_('Password')}" />