diff --git a/packages/@azure/arm-security/lib/models/index.ts b/packages/@azure/arm-security/lib/models/index.ts
index 78a3b7ecb605..491aee7cc5ab 100644
--- a/packages/@azure/arm-security/lib/models/index.ts
+++ b/packages/@azure/arm-security/lib/models/index.ts
@@ -68,9 +68,9 @@ export interface SecurityContact extends Resource {
    */
   email: string;
   /**
-   * @member {string} phone The phone number of this security contact
+   * @member {string} [phone] The phone number of this security contact
    */
-  phone: string;
+  phone?: string;
   /**
    * @member {AlertNotifications} alertNotifications Whether to send security
    * alerts notifications to the security contact. Possible values include:
diff --git a/packages/@azure/arm-security/lib/models/mappers.ts b/packages/@azure/arm-security/lib/models/mappers.ts
index 40229399b748..898a47ac8882 100644
--- a/packages/@azure/arm-security/lib/models/mappers.ts
+++ b/packages/@azure/arm-security/lib/models/mappers.ts
@@ -76,7 +76,6 @@ export const SecurityContact: msRest.CompositeMapper = {
         }
       },
       phone: {
-        required: true,
         serializedName: "properties.phone",
         type: {
           name: "String"