diff --git a/src/tutorial_pkg/src/my_first_node.cpp b/src/tutorial_pkg/src/my_first_node.cpp
index 1dd6e62..44c2b9c 100644
--- a/src/tutorial_pkg/src/my_first_node.cpp
+++ b/src/tutorial_pkg/src/my_first_node.cpp
@@ -1,6 +1,7 @@
 #include <ros/ros.h>
 #include <sensor_msgs/Image.h>
 #include <std_msgs/UInt8.h>
+#include "std_srvs/Empty.h"
 
 ros::Publisher brightness_pub;