diff --git a/depth_image_proc/include/depth_image_proc/conversions.hpp b/depth_image_proc/include/depth_image_proc/conversions.hpp
index 8af177bd0..a8f0e53c6 100644
--- a/depth_image_proc/include/depth_image_proc/conversions.hpp
+++ b/depth_image_proc/include/depth_image_proc/conversions.hpp
@@ -152,7 +152,7 @@ void convertIntensity(
 // Handles RGB8, BGR8, and MONO8
 void convertRgb(
   const sensor_msgs::msg::Image::ConstSharedPtr & rgb_msg,
-  sensor_msgs::msg::PointCloud2::SharedPtr cloud_msg,
+  const sensor_msgs::msg::PointCloud2::SharedPtr & cloud_msg,
   int red_offset, int green_offset, int blue_offset, int color_step);
 
 cv::Mat initMatrix(cv::Mat cameraMatrix, cv::Mat distCoeffs, int width, int height, bool radial);