diff --git a/examples/ros2-basic.nix b/examples/ros2-basic.nix
index 3d64865d69..e9dcd82c28 100755
--- a/examples/ros2-basic.nix
+++ b/examples/ros2-basic.nix
@@ -1,6 +1,7 @@
 # Environment containing basic ROS2 tools
 
-with import ../. {};
+{ pkgs ? import ../. {} }:
+with pkgs;
 with rosPackages.humble;
 
 mkShell {
diff --git a/examples/turtlebot3-gazebo.nix b/examples/turtlebot3-gazebo.nix
index a8c1c7f48e..49c30f1511 100755
--- a/examples/turtlebot3-gazebo.nix
+++ b/examples/turtlebot3-gazebo.nix
@@ -2,7 +2,8 @@
 # roslaunch turtlebot3_gazebo turtlebot3_world.launch
 # roslaunch turtlebot3_teleop turtlebot3_teleop_key.launch
 
-with import ../. {};
+{ pkgs ? import ../. {} }:
+with pkgs;
 with rosPackages.noetic;
 with pythonPackages;