diff --git a/tests/48admin.pl b/tests/48admin.pl
index 749788bcb..1cd51da0c 100644
--- a/tests/48admin.pl
+++ b/tests/48admin.pl
@@ -381,8 +381,8 @@ sub await_purge_complete {
          matrix_join_room( $remote_user, $room_id );
       })->then( sub {
          do_request_json_for( $admin,
-            method   => "POST",
-            full_uri => "/_synapse/admin/v1/rooms/$room_id/delete",
+            method   => "DELETE",
+            full_uri => "/_synapse/admin/v1/rooms/$room_id",
             content  => {
                new_room_user_id => $dummy_user->user_id,
                block => JSON::true,