diff --git a/nixos/machines/lobon/hardware-configuration.nix b/nixos/machines/lobon/hardware-configuration.nix
index 3e9d221..4830b2c 100644
--- a/nixos/machines/lobon/hardware-configuration.nix
+++ b/nixos/machines/lobon/hardware-configuration.nix
@@ -8,7 +8,7 @@
   fileSystems."/" = {
     device = "root";
     fsType = "tmpfs";
-    options = ["size=1G" "mode=755"];
+    options = ["size=521M" "mode=755"];
   };
   fileSystems."/persist" = {
     device = "/dev/disk/by-label/nixos";