diff --git a/lib/permissions/thread-permissions.js b/lib/permissions/thread-permissions.js
--- a/lib/permissions/thread-permissions.js
+++ b/lib/permissions/thread-permissions.js
@@ -155,6 +155,7 @@
 
 export type RolePermissionBlobs = {
   +Members: ThreadRolePermissionsBlob,
+  +Voiced?: ThreadRolePermissionsBlob,
   +Admins?: ThreadRolePermissionsBlob,
 };
 
@@ -399,6 +400,7 @@
   ) {
     return {
       Members: subthreadBasePermissions,
+      Voiced: { ...subthreadBasePermissions, ...voicedPermissions },
     };
   }