diff --git a/pkgs/nomarchy-install/compose-lock.py b/pkgs/nomarchy-install/compose-lock.py
index a97f6b5..c8f8193 100644
--- a/pkgs/nomarchy-install/compose-lock.py
+++ b/pkgs/nomarchy-install/compose-lock.py
@@ -40,6 +40,15 @@ def main() -> None:
     if "nomarchy" in nodes:
         sys.exit("compose-lock: upstream lock already has a 'nomarchy' node")
 
+    # Follows paths (list-valued inputs) are absolute from the lock's
+    # root; the copied nodes now live one level down, so ["nixpkgs"]
+    # must become ["nomarchy", "nixpkgs"]. Plain string values reference
+    # node keys directly and stay as they are.
+    for node in nodes.values():
+        for name, ref in node.get("inputs", {}).items():
+            if isinstance(ref, list):
+                node["inputs"][name] = ["nomarchy"] + ref
+
     nodes["nomarchy"] = {
         "inputs": nomarchy_inputs,
         "locked": locked,