diff --git a/invenio_rdm_records/resources/serializers/datacite/schema.py b/invenio_rdm_records/resources/serializers/datacite/schema.py
index 9c031ea386..6a7febb3de 100644
--- a/invenio_rdm_records/resources/serializers/datacite/schema.py
+++ b/invenio_rdm_records/resources/serializers/datacite/schema.py
@@ -94,8 +94,9 @@ def get_name_identifiers(self, obj):
                 name_id = {
                     "nameIdentifier": identifier["identifier"],
                     "nameIdentifierScheme": id_scheme,
-                    "schemeUri": scheme_uri,
                 }
+                if scheme_uri:
+                    name_id["schemeUri"] = scheme_uri
 
                 serialized_identifiers.append(name_id)
 
diff --git a/tests/resources/serializers/test_datacite_serializer.py b/tests/resources/serializers/test_datacite_serializer.py
index 0b75804208..fa0cdae5cc 100644
--- a/tests/resources/serializers/test_datacite_serializer.py
+++ b/tests/resources/serializers/test_datacite_serializer.py
@@ -409,7 +409,6 @@ def test_datacite43_serializer_with_unknown_id_schemes(
     expected_creator_id = {
         "nameIdentifier": "unknown-2345",
         "nameIdentifierScheme": "unknown-scheme",
-        "schemeUri": "",
     }
 
     serializer = DataCite43JSONSerializer()