diff --git a/osm_openvim/vim_schema.py b/osm_openvim/vim_schema.py
index a296083..1925f05 100644
--- a/osm_openvim/vim_schema.py
+++ b/osm_openvim/vim_schema.py
@@ -220,7 +220,8 @@
                     "vpci":pci_schema,
                     "imageRef":id_schema,
                     "xml":xml_text_schema,
-                    "dev":nameshort_schema
+                    "dev":nameshort_schema,
+                    "size":integer1_schema,
                 },
                 "additionalProperties": False,
                 "required": ["type"]