diff --git a/modules/server/containers/builder.nix b/modules/server/containers/builder.nix
index 7115935..8a2b79a 100644
--- a/modules/server/containers/builder.nix
+++ b/modules/server/containers/builder.nix
@@ -37,11 +37,9 @@ in {
     mkdir -p $out
     cp -r ./data/${dir}/. $out/
     find $out -type f | while read file; do
-      ${pkgs.replaceVarsWith {
-        name = "temp-sub";
-        src = "/dev/null"; # Dummy src, we use the script logic below
-        replacements = vars;
-      }}/bin/replace-vars "$file" --replace-inplace
+      ${lib.concatStringsSep "\n" (lib.mapAttrsToList (n: v: ''
+        substituteInPlace "$file" --replace "@${n}@" "${toString v}"
+      '') vars)}
     done
   '';
   host = "host.containers.internal";