diff --git a/ebi_ontologies.json b/ebi_ontologies.json
index c875f7e75..93512da22 100644
--- a/ebi_ontologies.json
+++ b/ebi_ontologies.json
@@ -1121,11 +1121,13 @@
     },
     {
        "id":"mamo",
+       "preferredPrefix": "MAMO",
        "title":"Mathematical Modelling Ontology",
        "label_property":"http://www.w3.org/2004/02/skos/core#prefLabel",
        "synonym_property":[
           "http://www.w3.org/2004/02/skos/core#altLabel"
-       ]
+       ],
+      "ontology_purl": "https://raw.githubusercontent.com/EBISPOT/mamo/main/mamo.rdf"
     },
     {
        "id":"mfoem",