diff --git a/eox_nelp/api_clients/certificates.py b/eox_nelp/api_clients/certificates.py
index 3f2bc3eb..c61be715 100644
--- a/eox_nelp/api_clients/certificates.py
+++ b/eox_nelp/api_clients/certificates.py
@@ -49,7 +49,7 @@ def create_external_certificate(self, certificate_data):
         path = "Certificates"
         user = certificate_data["user"]
         payload = {
-            "reference_id": f"openedx-lms-cert-{certificate_data['id']}",
+            "reference_id": f"nelc-openedx-lms-cert-{certificate_data['id']}",
             "date": {
                 "issuance": certificate_data["created_at"],
                 "expiration": None,