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
@@ -221,7 +221,6 @@
   const topLevelDescendantJoinThread =
     TOP_LEVEL_DESCENDANT + threadPermissions.JOIN_THREAD;
   const childJoinThread = CHILD + threadPermissions.JOIN_THREAD;
-  const descendantVoiced = DESCENDANT + threadPermissions.VOICED;
   const descendantEditEntries = DESCENDANT + threadPermissions.EDIT_ENTRIES;
   const descendantEditThreadName =
     DESCENDANT + threadPermissions.EDIT_THREAD_NAME;
@@ -266,7 +265,6 @@
     [descendantVisible]: true,
     [topLevelDescendantJoinThread]: true,
     [childJoinThread]: true,
-    [descendantVoiced]: true,
     [descendantEditEntries]: true,
     [descendantEditThreadName]: true,
     [descendantEditThreadColor]: true,
diff --git a/lib/types/thread-permission-types.test.js b/lib/types/thread-permission-types.test.js
--- a/lib/types/thread-permission-types.test.js
+++ b/lib/types/thread-permission-types.test.js
@@ -54,10 +54,9 @@
       adminsPermissionsConstructed.map(permission => [permission, true]),
     );
 
-    // Context: https://phab.comm.dev/D8478#inline-55680
     expect(
       deepDiff(adminsPermissionBlob, adminsPermissionsConstructedBlob),
-    ).toEqual({ descendant_voiced: true });
+    ).toEqual({});
   });
 });