diff --git a/default.nix b/default.nix
index 37aa08a..98d7d1b 100644
--- a/default.nix
+++ b/default.nix
@@ -25,6 +25,8 @@ self: super:
 
   ngtcp2 = super.callPackage ./pkgs/ngtcp2/default.nix { };
 
+  ngtcp2-debug = super.enableDebugging self.ngtcp2;
+
   inherit (super.callPackages ./pkgs/nim { })
     nim-unwrapped nimble-unwrapped nim;