diff --git a/hosts/radiobert/default.nix b/hosts/radiobert/default.nix
index 353249de..85512347 100644
--- a/hosts/radiobert/default.nix
+++ b/hosts/radiobert/default.nix
@@ -47,7 +47,7 @@
     # No ZFS on latest kernel:
     supportedFilesystems = lib.mkForce [ "vfat" "ext4" ];
 
-    tmpOnTmpfs = true;
+    tmp.useTmpfs = true;
     extraModulePackages = [ ];
     initrd = {
       availableKernelModules = [ "usbhid" ];