diff --git a/pkgs/misc/emulators/dlx/default.nix b/pkgs/misc/emulators/dlx/default.nix
index 01c5f866e1b0..feb474a13765 100644
--- a/pkgs/misc/emulators/dlx/default.nix
+++ b/pkgs/misc/emulators/dlx/default.nix
@@ -12,6 +12,8 @@ stdenv.mkDerivation {
 
   makeFlags = "LINK=gcc CFLAGS=-O2";
 
+  hardeningDisable = [ "format" ];
+
   installPhase = ''
     mkdir -p $out/include/dlx $out/share/dlx/{examples,doc} $out/bin
     mv -v masm mon dasm $out/bin/