diff --git a/specification/compute/resource-manager/Microsoft.Compute/stable/2018-10-01/compute.json b/specification/compute/resource-manager/Microsoft.Compute/stable/2018-10-01/compute.json
index 42e44cbd2823..85ea5ce278fd 100644
--- a/specification/compute/resource-manager/Microsoft.Compute/stable/2018-10-01/compute.json
+++ b/specification/compute/resource-manager/Microsoft.Compute/stable/2018-10-01/compute.json
@@ -7729,6 +7729,10 @@
           "type": "boolean",
           "description": "Specifies whether the Virtual Machine Scale Set should be overprovisioned."
         },
+        "doNotRunExtensionsOnOverprovisionedVMs": {
+          "type": "boolean",
+          "description": "When Overprovision is enabled, extensions are launched only on the requested number of VMs which are finally kept. This property will hence ensure that the extensions do not run on the extra overprovisioned VMs."
+        },
         "singlePlacementGroup": {
           "type": "boolean",
           "description": "When true this limits the scale set to a single placement group, of max size 100 virtual machines."
diff --git a/specification/compute/resource-manager/Microsoft.Compute/stable/2019-03-01/compute.json b/specification/compute/resource-manager/Microsoft.Compute/stable/2019-03-01/compute.json
index 163471ab472c..fd304a9830f1 100644
--- a/specification/compute/resource-manager/Microsoft.Compute/stable/2019-03-01/compute.json
+++ b/specification/compute/resource-manager/Microsoft.Compute/stable/2019-03-01/compute.json
@@ -8715,6 +8715,10 @@
           "type": "boolean",
           "description": "Specifies whether the Virtual Machine Scale Set should be overprovisioned."
         },
+        "doNotRunExtensionsOnOverprovisionedVMs": {
+          "type": "boolean",
+          "description": "When Overprovision is enabled, extensions are launched only on the requested number of VMs which are finally kept. This property will hence ensure that the extensions do not run on the extra overprovisioned VMs."
+        },
         "singlePlacementGroup": {
           "type": "boolean",
           "description": "When true this limits the scale set to a single placement group, of max size 100 virtual machines."