diff --git a/rogueviz/rogueviz.h b/rogueviz/rogueviz.h
index 20cd6affd..e9c524f04 100644
--- a/rogueviz/rogueviz.h
+++ b/rogueviz/rogueviz.h
@@ -133,6 +133,11 @@ namespace rogueviz {
     on_cleanup_or_next([backup, &variable] { variable = backup; });
     }
 
+  template<class T> void rv_keep(T& variable) {
+    T backup = variable;
+    on_cleanup_or_next([backup, &variable] { variable = backup; });
+    }
+
   template<class T, class U> void rv_hook(hookset<T>& m, int prio, U&& hook) {
     int p = addHook(m, prio, hook);
     auto del = [&m, p] {