diff --git a/shell.nix b/shell.nix
index b943bd7..32733f9 100644
--- a/shell.nix
+++ b/shell.nix
@@ -4,6 +4,7 @@ pkgs.mkShell {
   buildInputs = with pkgs; [
     clang
     just
+    lldb
     tup
     valgrind