diff --git a/specification/synapse/data-plane/Microsoft.Synapse/preview/2019-11-01-preview/monitoring.json b/specification/synapse/data-plane/Microsoft.Synapse/preview/2019-11-01-preview/monitoring.json
index a41141a84d23..27d62da3934b 100644
--- a/specification/synapse/data-plane/Microsoft.Synapse/preview/2019-11-01-preview/monitoring.json
+++ b/specification/synapse/data-plane/Microsoft.Synapse/preview/2019-11-01-preview/monitoring.json
@@ -162,10 +162,12 @@
           }
         },
         "sparkJobDefinition": {
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "pipeline": {
           "uniqueItems": false,
+          "x-nullable": true,
           "type": "array",
           "items": {
             "$ref": "#/definitions/SparkJob"