diff --git a/rclcpp/src/rclcpp/parameter_value.cpp b/rclcpp/src/rclcpp/parameter_value.cpp
index 7825eb417c..e88b225479 100644
--- a/rclcpp/src/rclcpp/parameter_value.cpp
+++ b/rclcpp/src/rclcpp/parameter_value.cpp
@@ -67,7 +67,7 @@ array_to_string(
   type_array << "[";
   type_array.setf(format_flags, std::ios_base::basefield | std::ios::boolalpha);
   type_array << std::showbase;
-  for (const ValType value : array) {
+  for (const ValType & value : array) {
     if (!first_item) {
       type_array << ", ";
     } else {