diff --git a/README.md b/README.md
index 53c47c5d5c..8fa6e8fa4b 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,6 @@ nix-shell \
   --option extra-substituters 'https://ros.cachix.org' \
   --option trusted-public-keys 'cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= ros.cachix.org-1:dSyZxI8geDCJrwgvCOHDoAfOm5sV1wCPjBkKL+38Rvo=' \
   '<nix-ros-overlay/examples/turtlebot3-gazebo.nix>'
-export TURTLEBOT3_MODEL=burger
 # If not on NixOS, nixGL (https://github.com/guibou/nixGL) is needed for OpenGL support
 roslaunch turtlebot3_gazebo turtlebot3_world.launch
 # Spawn a new nix-shell in a new terminal and then:
diff --git a/examples/turtlebot3-gazebo.nix b/examples/turtlebot3-gazebo.nix
index 014eb8bcc3..a6197066e0 100755
--- a/examples/turtlebot3-gazebo.nix
+++ b/examples/turtlebot3-gazebo.nix
@@ -3,7 +3,7 @@
 # roslaunch turtlebot3_teleop turtlebot3_teleop_key.launch
 
 with import ../. {};
-with rosPackages.kinetic;
+with rosPackages.melodic;
 with pythonPackages;
 
 mkShell {