diff --git a/flake.nix b/flake.nix
index d36075c..da2a041 100644
--- a/flake.nix
+++ b/flake.nix
@@ -55,6 +55,7 @@
               pkgs.pkg-config
               pkgs.clang-tools # clangd
               pkgs.valgrind
+              pkgs.gdb
               # TODO: set up cargo-valgrind in shell and build
               #       currently both this and `cargo install cargo-valgrind`
               #       produce a binary that says ENOENT.