diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2020-06-01/customIpPrefix.json b/specification/network/resource-manager/Microsoft.Network/stable/2020-06-01/customIpPrefix.json
index b0342f85d606..7e91169a1d4d 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2020-06-01/customIpPrefix.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2020-06-01/customIpPrefix.json
@@ -368,7 +368,6 @@
           "description": "The master custom IP Prefix parent."
         },
         "commissionedState": {
-          "readOnly": true,
           "type": "string",
           "description": "The commissioned state of the Custom IP Prefix.",
           "enum": [