diff --git a/mini/hardware-configuration.nix b/mini/hardware-configuration.nix
index dc163a7..648b234 100644
--- a/mini/hardware-configuration.nix
+++ b/mini/hardware-configuration.nix
@@ -16,6 +16,7 @@
   fileSystems."/" =
     { device = "none";
       fsType = "tmpfs";
+      options = [ "defaults" "size=8G" "mode=755" ];
     };
 
   fileSystems."/boot" =
diff --git a/mio/hardware-configuration.nix b/mio/hardware-configuration.nix
index 42e0866..b17b454 100644
--- a/mio/hardware-configuration.nix
+++ b/mio/hardware-configuration.nix
@@ -16,6 +16,7 @@
   fileSystems."/" =
     { device = "none";
       fsType = "tmpfs";
+      options = [ "defaults" "size=8G" "mode=755" ];
     };
 
   fileSystems."/boot" =
diff --git a/neko/hardware-configuration.nix b/neko/hardware-configuration.nix
index 6ae6a4f..1843730 100644
--- a/neko/hardware-configuration.nix
+++ b/neko/hardware-configuration.nix
@@ -16,6 +16,7 @@
   fileSystems."/" =
     { device = "none";
       fsType = "tmpfs";
+      options = [ "defaults" "size=8G" "mode=755" ];
     };
 
   fileSystems."/boot" =