1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libexpr/eval.hh b/third_party/nix/src/libexpr/eval.hh
index 3e875fa811..3a0ad8e126 100644
--- a/third_party/nix/src/libexpr/eval.hh
+++ b/third_party/nix/src/libexpr/eval.hh
@@ -65,7 +65,7 @@ typedef std::map<Path, Expr*, std::less<Path>,
                  traceable_allocator<std::pair<const Path, Expr*>>>
     FileParseCache;
 
-class EvalState {
+class EvalState : public gc {
  public:
   SymbolTable symbols;