diff --git a/pom.xml b/pom.xml
index 22a52e0..1eb60d2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,7 +10,7 @@
 	</parent>
 	<groupId>org.gcube.dvos</groupId>
 	<artifactId>usermanagement-core</artifactId>
-	<version>2.4.2-SNAPSHOT</version>
+	<version>2.5.0-SNAPSHOT</version>
 	<packaging>jar</packaging>
 
 	<name>User Management API</name>
diff --git a/src/main/java/org/gcube/vomanagement/usermanagement/impl/LiferayUserManager.java b/src/main/java/org/gcube/vomanagement/usermanagement/impl/LiferayUserManager.java
index 187a801..9e04d82 100644
--- a/src/main/java/org/gcube/vomanagement/usermanagement/impl/LiferayUserManager.java
+++ b/src/main/java/org/gcube/vomanagement/usermanagement/impl/LiferayUserManager.java
@@ -45,6 +45,7 @@ import com.liferay.portal.model.Role;
 import com.liferay.portal.model.RoleConstants;
 import com.liferay.portal.model.Team;
 import com.liferay.portal.model.User;
+import com.liferay.portal.model.UserGroupRole;
 import com.liferay.portal.security.auth.PrincipalThreadLocal;
 import com.liferay.portal.security.permission.PermissionChecker;
 import com.liferay.portal.security.permission.PermissionCheckerFactoryUtil;
@@ -57,6 +58,7 @@ import com.liferay.portal.service.RoleLocalServiceUtil;
 import com.liferay.portal.service.RoleServiceUtil;
 import com.liferay.portal.service.ServiceContext;
 import com.liferay.portal.service.TeamLocalServiceUtil;
+import com.liferay.portal.service.UserGroupRoleLocalServiceUtil;
 import com.liferay.portal.service.UserLocalServiceUtil;
 import com.liferay.portal.util.PortalUtil;
 import com.liferay.portal.webserver.WebServerServletTokenUtil;
@@ -753,24 +755,15 @@ public class LiferayUserManager implements UserManager {
 	 */
 	@Override
 	public List<GCubeUser> listUsersByGroupAndRole(long groupId, long roleId) throws UserManagementSystemException, RoleRetrievalFault,	GroupRetrievalFault, UserRetrievalFault {
-		Map<GCubeUser, List<GCubeRole>> toIterate = listUsersAndRolesByGroup(groupId);
 		List<GCubeUser> toReturn = new ArrayList<GCubeUser>();
-		Role askedRole = null;
 		try {
-			askedRole = RoleServiceUtil.getRole(roleId);
-		} catch (PortalException e) {
-			throw new RoleRetrievalFault("Role not existing (I think you better check) roleId="+roleId, e);
-		} catch (SystemException e) {
-			e.printStackTrace();
-		}
-		_log.debug("Asked for role: "+askedRole.getName());	
-		for (GCubeUser u : toIterate.keySet()) {
-			for (GCubeRole role : toIterate.get(u)) 
-				if (role.getRoleId() == roleId) {
-					toReturn.add(u);
-					break;
-				}				
-		}		
+			List<UserGroupRole> listTriplet = UserGroupRoleLocalServiceUtil.getUserGroupRolesByGroupAndRole(groupId, roleId);
+			for (UserGroupRole userGroupRole : listTriplet) {
+				toReturn.add(getUserById(userGroupRole.getUserId()));
+			}
+		} catch (SystemException e1) {
+			e1.printStackTrace();
+		}	
 		return toReturn;
 	}
 	/**