diff --git a/home-manager/progs/fish.nix b/home-manager/progs/fish.nix
index c037d03..735cbf7 100644
--- a/home-manager/progs/fish.nix
+++ b/home-manager/progs/fish.nix
@@ -48,7 +48,7 @@ in
 
       nix-cleanup = "doas nix-collect-garbage --delete-older-than 1d && doas nix-store --optimise && doas nix-store --gc";
 
-      gcc-native = "${pkgs.gcc}/bin/gcc -Q --help=target -mtune=native -march=native | ${pkgs.gnugrep}/bin/grep -E '(mtune|march)=' | ${pkgs.gnugrep}/bin/grep -v 'Known valid arguments' | ${pkgs.gnused}/bin/sed -E \"s/[[:space:]]+//g\"";
+      gcc-native = "${pkgs.gcc}/bin/gcc -Q --help=target -mtune=native -march=native | ${pkgs.gnugrep}/bin/grep -E '^\\s+\-(mtune|march)=' | ${pkgs.gnused}/bin/sed -E 's/\\s+//g'";
 
       chess = "${pkgs.chess-tui}/bin/chess-tui -e ${pkgs.stockfish}/bin/stockfish";
     };