diff --git a/src/main/java/org/gcube/portal/oidc/lr62/UserSitesToGroupsAndRolesMapper.java b/src/main/java/org/gcube/portal/oidc/lr62/UserSitesToGroupsAndRolesMapper.java
index 3b2f961..857843f 100644
--- a/src/main/java/org/gcube/portal/oidc/lr62/UserSitesToGroupsAndRolesMapper.java
+++ b/src/main/java/org/gcube/portal/oidc/lr62/UserSitesToGroupsAndRolesMapper.java
@@ -159,7 +159,10 @@ public class UserSitesToGroupsAndRolesMapper {
                 log.info("Checking actual roles in the site's group");
                 for (String gcRoleName : actualSiteGroupRoles) {
                     String actualSiteName = actualSite.getName();
-                    if (!actualSite.getRoles().contains(gcRoleName)) {
+                    // 'D4ScienceMappings.Role.valueOf(gcRoleName) != null' is used to be sure that is a d4s role and not
+                    // a Liferay role that must be let as it is
+                    if (D4ScienceMappings.Role.valueOf(gcRoleName) != null
+                            && !actualSite.getRoles().contains(gcRoleName)) {
                         try {
                             log.info("Removing '" + gcRoleName + "' user's role for site: " + actualSiteName);
                             roleManager.removeRoleFromUser(user.getUserId(), actualSiteGroupId,