diff --git a/flake.lock b/flake.lock
index 389a35c..a6d0863 100644
--- a/flake.lock
+++ b/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1651007983,
-        "narHash": "sha256-GNay7yDPtLcRcKCNHldug85AhAvBpTtPEJWSSDYBw8U=",
+        "lastModified": 1651726670,
+        "narHash": "sha256-dSGdzB49SEvdOJvrQWfQYkAefewXraHIV08Vz6iDXWQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e10da1c7f542515b609f8dfbcf788f3d85b14936",
+        "rev": "c777cdf5c564015d5f63b09cc93bef4178b19b01",
         "type": "github"
       },
       "original": {
diff --git a/src/nix-eval-jobs.cc b/src/nix-eval-jobs.cc
index 8ffd036..eb97d0b 100644
--- a/src/nix-eval-jobs.cc
+++ b/src/nix-eval-jobs.cc
@@ -287,14 +287,14 @@ static void worker(EvalState &state, Bindings &autoArgs, AutoCloseFD &to,
                     path.size() == 0; // Dont require `recurseForDerivations =
                                       // true;` for top-level attrset
 
-                for (auto &i : v->attrs->lexicographicOrder()) {
-                    std::string name(i->name);
+                for (auto &i : v->attrs->lexicographicOrder(state.symbols)) {
+                    const std::string &name = state.symbols[i->name];
                     attrs.push_back(name);
 
                     if (name == "recurseForDerivations") {
                         auto attrv =
                             v->attrs->get(state.sRecurseForDerivations);
-                        recurse = state.forceBool(*attrv->value, *attrv->pos);
+                        recurse = state.forceBool(*attrv->value, attrv->pos);
                     }
                 }
                 if (recurse)