diff --git a/pkgs/by-name/gr/grub2/package.nix b/pkgs/by-name/gr/grub2/package.nix
index 392a6ed6e794..6ab78b82c4eb 100644
--- a/pkgs/by-name/gr/grub2/package.nix
+++ b/pkgs/by-name/gr/grub2/package.nix
@@ -223,6 +223,9 @@ stdenv.mkDerivation rec {
 
   strictDeps = true;
 
+  # glibc 2.43 C23 const-preserving strchr/strstr macros
+  env.NIX_CFLAGS_COMPILE = "-Wno-error=discarded-qualifiers";
+
   hardeningDisable = [ "all" ];
 
   separateDebugInfo = !xenSupport;