diff --git a/schemas/legacy.json b/schemas/legacy.json
index b010d07..551f371 100644
--- a/schemas/legacy.json
+++ b/schemas/legacy.json
@@ -69,6 +69,9 @@
                 "EntityInstance": {
                     "$ref": "#/definitions/Types/EntityInstance"
                 },
+                "EndpointId": {
+                    "$ref": "#/definitions/Types/EndpointId"
+                },
                 "FaultIndex": {
                     "$ref": "#/definitions/Types/FaultIndex"
                 },
@@ -689,6 +692,9 @@
             "EntityInstance": {
                 "type": "number"
             },
+            "EndpointId": {
+                "type": ["string", "number"]
+            },
             "FaultIndex": {
                 "type": "number"
             },