diff --git a/scripts/lib/nix.fish b/scripts/lib/nix.fish
index 670c8f89..36e795e0 100644
--- a/scripts/lib/nix.fish
+++ b/scripts/lib/nix.fish
@@ -17,7 +17,6 @@ begin
             and git -C "$nixPkgsCache" remote add origin https://github.com/NixOS/nixpkgs.git
             and git -C "$nixPkgsCache" fetch --depth=1 origin "$nixPkgsVersion"
             and git -C "$nixPkgsCache" reset --hard FETCH_HEAD
-            and rm -rf "$nixPkgsCache/.git"
         end
     end
 
@@ -29,8 +28,8 @@ begin
                 downloadNixPkgs
             end
 
-            sudo mkdir -p "$nixPkgsDir"
-            sudo cp -r "$nixPkgsCache"/* "$nixPkgsDir"
+            sudo rm -rf "$nixPkgsDir"
+            sudo cp -r "$nixPkgsCache" "$nixPkgsDir"
         end
     end