diff --git a/scripts/Common/OS/setup.fish b/scripts/Common/OS/setup.fish
index a1bf1295..a0429da6 100755
--- a/scripts/Common/OS/setup.fish
+++ b/scripts/Common/OS/setup.fish
@@ -79,7 +79,7 @@ function runSetup
         end | runChroot "$mountDir" tee /root/.bash_profile >/dev/null
     end
 
-    function prepareNix
+    function prepareNix -V dir
         source "$dir/../../lib/nix.fish"
 
         # Copy `nixpkgs` channel