diff --git a/ros2nix/ros2nix.py b/ros2nix/ros2nix.py
index 616b440..c015633 100755
--- a/ros2nix/ros2nix.py
+++ b/ros2nix/ros2nix.py
@@ -449,6 +449,7 @@ def ros2nix(args):
                     arg
                     for arg in sys.argv[1:]
                     if not (arg.endswith("package.xml") and os.path.isfile(arg))
+                    and arg != "--compare"
                 ]
             )
             derivation_text = f"# Automatically generated by: {our_cmd_line}\n"