diff --git a/modules/filesystem/chn-PC.nix b/modules/filesystem/chn-PC.nix
index 0020b9de..8ee73b4d 100644
--- a/modules/filesystem/chn-PC.nix
+++ b/modules/filesystem/chn-PC.nix
@@ -48,5 +48,7 @@
 			# 	"/etc/ssh/ssh_host_rsa_key"
 			# ];
 		};
+		systemd.services.nix-daemon =
+			{ environment = { TMPDIR = "/var/cache/nix"; }; serviceConfig = { CacheDirectory = "nix"; }; };
 	};
 }