diff --git a/src/launcher/main.rs b/src/launcher/main.rs
index ecbf58576f90b877e26030ba625299c2f8790c3e..bd43a7f147ce90c8d6a8e0cf422cf4052971684a 100644
--- a/src/launcher/main.rs
+++ b/src/launcher/main.rs
@@ -442,7 +442,7 @@ fn bar_main() {
 
     event_queue.run().expect("launcher: failed to run event loop");
 
-    for mut child in bar.borrow_mut().children.iter_mut() {
+    for child in bar.borrow_mut().children.iter_mut() {
         let pid = child.id();
         match child.kill() {
             Ok(()) => (),