diff --git a/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2023-04-01-preview/Incidents.json b/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2023-04-01-preview/Incidents.json
index db91c35f690b..e97b5fea8391 100644
--- a/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2023-04-01-preview/Incidents.json
+++ b/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2023-04-01-preview/Incidents.json
@@ -1386,7 +1386,8 @@
         },
         "providerName": {
           "description": "The name of the source provider that generated the incident",
-          "type": "string"
+          "type": "string",
+          "readOnly": true
         },
         "providerIncidentId": {
           "description": "The incident ID assigned by the incident provider",