diff --git a/schemas/legacy.json b/schemas/legacy.json
index 597a655..aded4d3 100644
--- a/schemas/legacy.json
+++ b/schemas/legacy.json
@@ -980,7 +980,9 @@
                 "const": "MB Upstream Port"
             },
             "CpuID": {
-                "type": "number"
+                "type": "number",
+                "minimum": 0,
+                "multipleOf": 1
             },
             "CurrScaleFactor": {
                 "type": "number"