diff --git a/docker/ros_melodic/Dockerfile b/docker/ros_melodic/Dockerfile
index 64339f6..03254af 100644
--- a/docker/ros_melodic/Dockerfile
+++ b/docker/ros_melodic/Dockerfile
@@ -14,7 +14,7 @@ RUN touch /etc/apt/apt.conf.d/99fixbadproxy && \
     echo "source /etc/bash_completion" >> /root/.bashrc
 
 RUN sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list' && \
-    curl -s https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc | sudo apt-key add -
+    curl -s https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc | apt-key add -
 RUN apt update && \
     apt install -y ros-$ROS_DISTRO-desktop-full ros-$ROS_DISTRO-rosserial ros-$ROS_DISTRO-rosserial-arduino python-rosdep python-catkin-tools && \
     echo "ros installed"