diff --git a/default.nix b/default.nix
index 1577aed0..6408d618 100644
--- a/default.nix
+++ b/default.nix
@@ -4,6 +4,7 @@ let
   env = with pkgs.rustUnstable; [
     rustc
     cargo
+    pkgs.llvmPackages.lldb
   ];
 in