diff --git a/clap_builder/src/builder/command.rs b/clap_builder/src/builder/command.rs
index 603942af..62930766 100644
--- a/clap_builder/src/builder/command.rs
+++ b/clap_builder/src/builder/command.rs
@@ -4030,7 +4030,7 @@ impl Command {
             }
             .to_owned();
 
-            for mut sc in &mut self.subcommands {
+            for sc in &mut self.subcommands {
                 debug!("Command::_build_bin_names:iter: bin_name set...");
 
                 if sc.usage_name.is_none() {