1 files changed, 4 insertions, 1 deletions
diff --git a/third_party/nix/src/nix/repl.cc b/third_party/nix/src/nix/repl.cc
index 9431b5b60f55..823bb3b88ca5 100644
--- a/third_party/nix/src/nix/repl.cc
+++ b/third_party/nix/src/nix/repl.cc
@@ -22,6 +22,9 @@
 #include "libutil/finally.hh"
 #include "nix/command.hh"
 
+#define GC_INCLUDE_NEW
+#include <gc/gc_cpp.h>
+
 namespace nix {
 
 #define ESC_RED "\033[31m"
@@ -32,7 +35,7 @@ namespace nix {
 #define ESC_CYA "\033[36m"
 #define ESC_END "\033[0m"
 
-struct NixRepl {
+struct NixRepl : gc {
   std::string curDir;
   EvalState state;
   Bindings* autoArgs;