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 a85bfa7..db0d77a 100644
--- a/src/main/java/org/gcube/vomanagement/usermanagement/impl/LiferayUserManager.java
+++ b/src/main/java/org/gcube/vomanagement/usermanagement/impl/LiferayUserManager.java
@@ -882,10 +882,17 @@ public class LiferayUserManager implements UserManager {
 		} catch (SystemException e) {
 			e.printStackTrace();
 		} 
+		DynamicQuery queryListPendingMembershipRequestsByGroup = DynamicQueryFactoryUtil.forClass
+				(MembershipRequest.class, PortalClassLoaderUtil.getClassLoader());
+		
+		queryListPendingMembershipRequestsByGroup.add(PropertyFactoryUtil.forName("groupId").eq(new Long(groupId)));
+		
 		List<GCubeMembershipRequest> toReturn = new ArrayList<GCubeMembershipRequest>();
 		try {
-			int requestesNo = MembershipRequestLocalServiceUtil.getMembershipRequestsCount();
-			for (MembershipRequest req : MembershipRequestLocalServiceUtil.getMembershipRequests(0, requestesNo)) {
+			
+			@SuppressWarnings("unchecked")
+			List<MembershipRequest> list = MembershipRequestLocalServiceUtil.dynamicQuery(queryListPendingMembershipRequestsByGroup);
+			for (MembershipRequest req : list) {
 				if (req.getGroupId() == groupId) {
 					toReturn.add(mapLRMembershipRequest(req));
 				}