diff --git a/pkgs/tools/networking/pacparser/default.nix b/pkgs/tools/networking/pacparser/default.nix
index 54b3cf8fd81e..fbb17308f90c 100644
--- a/pkgs/tools/networking/pacparser/default.nix
+++ b/pkgs/tools/networking/pacparser/default.nix
@@ -17,6 +17,8 @@ stdenv.mkDerivation rec {
     cd src
   '';
 
+  hardeningDisable = [ "format" ];
+
   meta = with stdenv.lib; {
     description = "A library to parse proxy auto-config (PAC) files";
     homepage = http://pacparser.manugarg.com/;