diff --git a/modules/filesystem/chn-PC.nix b/modules/filesystem/chn-PC.nix
index 8ee73b4d..e1479855 100644
--- a/modules/filesystem/chn-PC.nix
+++ b/modules/filesystem/chn-PC.nix
@@ -13,7 +13,7 @@
 			{
 				device = "/dev/mapper/root";
 				fsType = "btrfs";
-				options = [ "subvol=@nix" "compress-force=zstd:3" ];
+				options = [ "subvol=@nix" "compress-force=zstd:15" ];
 			};
 			"/boot" =
 			{