diff --git a/pkgs/development/libraries/opencascade/default.nix b/pkgs/development/libraries/opencascade/default.nix
index ec15d9d631e6..bcf1b747180e 100644
--- a/pkgs/development/libraries/opencascade/default.nix
+++ b/pkgs/development/libraries/opencascade/default.nix
@@ -17,6 +17,8 @@ stdenv.mkDerivation rec {
   # https://bugs.freedesktop.org/show_bug.cgi?id=83631
   NIX_CFLAGS_COMPILE = "-DGLX_GLXEXT_LEGACY";
 
+  hardening_format = false;
+
   postInstall = ''
     mv $out/inc $out/include
     mkdir -p $out/share/doc/${name}