diff --git a/default.nix b/default.nix
index 42fdc21..097662b 100644
--- a/default.nix
+++ b/default.nix
@@ -35,6 +35,7 @@ stdenv.mkDerivation {
   ];
 
   shellHook = ''
+    unset NIX_HARDENING_ENABLE
     export CPM_DISABLE=ON
   '';