diff --git a/lib/services/apimanagement/lib/models/hostnameConfiguration.js b/lib/services/apimanagement/lib/models/hostnameConfiguration.js
index d6381df03c..fc7929f78d 100644
--- a/lib/services/apimanagement/lib/models/hostnameConfiguration.js
+++ b/lib/services/apimanagement/lib/models/hostnameConfiguration.js
@@ -118,7 +118,6 @@ class HostnameConfiguration {
           },
           certificate: {
             required: false,
-            readOnly: true,
             serializedName: 'certificate',
             type: {
               name: 'Composite',
diff --git a/lib/services/apimanagement/lib/models/index.d.ts b/lib/services/apimanagement/lib/models/index.d.ts
index 48c36d2055..d5d2705258 100644
--- a/lib/services/apimanagement/lib/models/index.d.ts
+++ b/lib/services/apimanagement/lib/models/index.d.ts
@@ -1911,7 +1911,7 @@ export interface HostnameConfiguration {
   certificatePassword?: string;
   defaultSslBinding?: boolean;
   negotiateClientCertificate?: boolean;
-  readonly certificate?: CertificateInformation;
+  certificate?: CertificateInformation;
 }
 
 /**