diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/common/Util.java b/libreplan-webapp/src/main/java/org/libreplan/web/common/Util.java
index 698bf6e50..8ecce7d15 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/common/Util.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/common/Util.java
@@ -718,17 +718,29 @@ public class Util {
      *
      * If <code>removeButtonListener</code> is null, it only adds the edit
      * button and the <code>ON_CLICK</code> event.
+     *
+     * @return An array of 1 or 2 positions (depending if
+     *         <code>removeButtonListener</code> param is or not
+     *         <code>null</code>) with the edit and remove buttons. As maybe you
+     *         need to disable any of them depending on different situations.
      */
-    public static void appendOperationsAndOnClickEvent(Row row,
+    public static Button[] appendOperationsAndOnClickEvent(Row row,
             EventListener editButtonListener, EventListener removeButtonListener) {
+        Button[] buttons = new Button[removeButtonListener != null ? 2 : 1];
+
         Hbox hbox = new Hbox();
-        hbox.appendChild(Util.createEditButton(editButtonListener));
+        buttons[0] = Util.createEditButton(editButtonListener);
+        hbox.appendChild(buttons[0]);
+
         if (removeButtonListener != null) {
-            hbox.appendChild(Util.createRemoveButton(removeButtonListener));
+            buttons[1] = Util.createRemoveButton(removeButtonListener);
+            hbox.appendChild(buttons[1]);
         }
         row.appendChild(hbox);
 
         row.addEventListener(Events.ON_CLICK, editButtonListener);
+
+        return buttons;
     }
 
     /**
diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/users/UserCRUDController.java b/libreplan-webapp/src/main/java/org/libreplan/web/users/UserCRUDController.java
index 28ef82f3b..d2ad5ec7f 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/users/UserCRUDController.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/users/UserCRUDController.java
@@ -43,6 +43,7 @@ import org.libreplan.web.common.entrypoints.EntryPointsHandler;
 import org.libreplan.web.common.entrypoints.IURLHandlerRegistry;
 import org.libreplan.web.resources.worker.IWorkerCRUDControllerEntryPoints;
 import org.libreplan.web.security.SecurityUtils;
+import org.libreplan.web.users.bootstrap.MandatoryUser;
 import org.zkoss.zk.ui.Component;
 import org.zkoss.zk.ui.WrongValueException;
 import org.zkoss.zk.ui.event.Event;
@@ -101,7 +102,8 @@ public class UserCRUDController extends BaseCRUDController<User> implements
             Util.appendLabel(row, user.isBound() ? user.getWorker()
                     .getShortDescription() : "");
 
-            Util.appendOperationsAndOnClickEvent(row, new EventListener() {
+            Button[] buttons = Util.appendOperationsAndOnClickEvent(row,
+                    new EventListener() {
                 @Override
                 public void onEvent(Event event) throws Exception {
                     goToEditForm(user);
@@ -112,7 +114,15 @@ public class UserCRUDController extends BaseCRUDController<User> implements
                     confirmDelete(user);
                 }
             });
+
+            // Disable remove button for default admin as it's mandatory
+            if (isDefaultAdmin(user)) {
+                buttons[1].setDisabled(true);
+                buttons[1]
+                        .setTooltiptext(_("Default user \"admin\" cannot be removed as it is mandatory"));
+            }
         }
+
     };
 
     @Override
@@ -320,7 +330,8 @@ public class UserCRUDController extends BaseCRUDController<User> implements
                     }
                 });
                 removeButton.setDisabled(getLdapUserRolesLdapConfiguration()
-                        || role.equals(UserRole.ROLE_BOUND_USER));
+                        || role.equals(UserRole.ROLE_BOUND_USER)
+                        || isUserDefaultAdmin());
                 row.appendChild(removeButton);
             }
         };
@@ -405,4 +416,24 @@ public class UserCRUDController extends BaseCRUDController<User> implements
         return "";
     }
 
+    private boolean isDefaultAdmin(final User user) {
+        return user.getLoginName().equals(MandatoryUser.ADMIN.getLoginName());
+    }
+
+    private boolean isUserDefaultAdmin() {
+        User user = userModel.getUser();
+        if (user != null) {
+            return isDefaultAdmin(user);
+        }
+        return false;
+    }
+
+    public boolean areRolesAndProfilesDisabled() {
+        return isLdapUserLdapConfiguration() || isUserDefaultAdmin();
+    }
+
+    public boolean isLdapUserOrDefaultAdmin() {
+        return isLdapUser() || isUserDefaultAdmin();
+    }
+
 }
diff --git a/libreplan-webapp/src/main/webapp/users/_editUser.zul b/libreplan-webapp/src/main/webapp/users/_editUser.zul
index 8f16a6ea8..e54f9c856 100644
--- a/libreplan-webapp/src/main/webapp/users/_editUser.zul
+++ b/libreplan-webapp/src/main/webapp/users/_editUser.zul
@@ -49,7 +49,7 @@
                                     value="@{controller.user.loginName}" width="300px"
                                     constraint="no empty:${i18n:_('cannot be null or empty')}"
                                     onBlur="controller.updateWindowTitle()"
-                                    disabled="@{controller.ldapUser}" />
+                                    disabled="@{controller.ldapUserOrDefaultAdmin}" />
                             </row>
                             <row>
                                 <label value="${i18n:_('First name')}" />
@@ -78,7 +78,7 @@
                                 <label value="${i18n:_('Disabled')}" />
                                 <checkbox id="disabled"
                                     checked="@{controller.user.disabled}" width="300px"
-                                    disabled="@{controller.ldapUser}" />
+                                    disabled="@{controller.ldapUserOrDefaultAdmin}" />
                             </row>
                             <row>
                                 <label value="${i18n:_('E-mail')}" />
@@ -130,7 +130,8 @@
                     <hbox align="center">
                         <combobox id="userRolesCombo" autodrop="true" />
                         <button label="${i18n:_('Add role')}"
-                            onClick="controller.addSelectedRole()" disabled="@{controller.ldapUserRolesLdapConfiguration}"/>
+                            onClick="controller.addSelectedRole()"
+                            disabled="@{controller.areRolesAndProfilesDisabled}" />
                     </hbox>
                     <grid id="listing" model="@{controller.roles}"
                         rowRenderer="@{controller.rolesRenderer}">
@@ -152,7 +153,8 @@
                             autodrop="true" constraint=""
                             finder="ProfileFinder" />
                         <button label="${i18n:_('Add profile')}"
-                            onClick="controller.addSelectedProfile()" disabled="@{controller.ldapUserRolesLdapConfiguration}"/>
+                            onClick="controller.addSelectedProfile()"
+                            disabled="@{controller.areRolesAndProfilesDisabled}" />
                     </hbox>
                     <grid id="profilesListing" model="@{controller.profiles}">
                         <columns sizable="true">
@@ -166,7 +168,8 @@
                                     <button sclass="icono" image="/common/img/ico_borrar1.png"
                                         hoverImage="/common/img/ico_borrar.png"
                                         tooltiptext="${i18n:_('Delete')}"
-                                        onClick="controller.removeProfile(self.parent.parent.value);" disabled="@{controller.ldapUserRolesLdapConfiguration}">
+                                        onClick="controller.removeProfile(self.parent.parent.value);"
+                                        disabled="@{controller.areRolesAndProfilesDisabled}" >
                                     </button>
                                 </hbox>
                             </row>