diff --git a/pkgs/development/libraries/fox/default.nix b/pkgs/development/libraries/fox/default.nix
index 2d44444ab40..78b7e9a63fc 100644
--- a/pkgs/development/libraries/fox/default.nix
+++ b/pkgs/development/libraries/fox/default.nix
@@ -18,6 +18,8 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
+  hardening_format = false;
+
   meta = {
     description = "C++ based class library for building Graphical User Interfaces";
     longDescription = ''