diff --git a/mux/src/window.rs b/mux/src/window.rs
index 84205741f4a..a086e3a3191 100644
--- a/mux/src/window.rs
+++ b/mux/src/window.rs
@@ -131,6 +131,8 @@ impl Window {
 
         if len > 0 && self.active >= len {
             self.set_active_without_saving(len - 1);
+        } else {
+            self.invalidate();
         }
     }