diff --git a/src/swapper.rs b/src/swapper.rs
index 3985b3b..ade9c10 100644
--- a/src/swapper.rs
+++ b/src/swapper.rs
@@ -406,7 +406,7 @@ mod tests {
     swapper.execute_thumbs();
     swapper.swap_panes();
 
-    let expectation = vec!["tmux", "swap-pane", "-d", "-s", "%98", "-t", "%100"];
+    let expectation = vec!["tmux", "swap-pane", "-d", "-s", "%98", "-t", "%100", "-Z"];
 
     assert_eq!(executor.last_executed().unwrap(), expectation);
   }