diff --git a/sciurus17_control/src/sciurus17_hardware.cpp b/sciurus17_control/src/sciurus17_hardware.cpp
index 9e4dfd7..54f3d42 100644
--- a/sciurus17_control/src/sciurus17_hardware.cpp
+++ b/sciurus17_control/src/sciurus17_hardware.cpp
@@ -212,7 +212,7 @@ CallbackReturn Sciurus17Hardware::on_activate(const rclcpp_lifecycle::State & /*
 CallbackReturn Sciurus17Hardware::on_deactivate(const rclcpp_lifecycle::State & /*previous_state*/)
 {
   // Set low PID gains for safe stopping.
-  for (auto group_name : GROUP_NAMES) {
+  for (const auto & group_name : GROUP_NAMES) {
     if (!hardware_->write_position_pid_gain_to_group(
         group_name, STOP_P_GAIN, STOP_I_GAIN, STOP_D_GAIN))
     {