diff --git a/pkgs/development/tools/yarn2nix-moretea/yarn2nix/lib/generateNix.js b/pkgs/development/tools/yarn2nix-moretea/yarn2nix/lib/generateNix.js
index 5004e6f3903df..e2bae7d3d6e33 100644
--- a/pkgs/development/tools/yarn2nix-moretea/yarn2nix/lib/generateNix.js
+++ b/pkgs/development/tools/yarn2nix-moretea/yarn2nix/lib/generateNix.js
@@ -49,7 +49,8 @@ function fetchgit(fileName, url, rev, branch, builtinFetchGit) {
           url = "${url}";
           ref = "${branch}";
           rev = "${rev}";
-        } // (if builtins.substring 0 3 builtins.nixVersion == "2.4" then {
+        } // (if builtins.compareVersions "2.4pre" builtins.nixVersion < 0 then {
+          # workaround for https://github.com/NixOS/nix/issues/5128
           allRefs = true;
         } else {}));
       ` : `