diff --git a/nixos/modules/virtualisation/amazon-image.nix b/nixos/modules/virtualisation/amazon-image.nix
index f6d8848816d4..ed12029fc5c7 100644
--- a/nixos/modules/virtualisation/amazon-image.nix
+++ b/nixos/modules/virtualisation/amazon-image.nix
@@ -28,13 +28,13 @@ in
 
     boot.growPartition = true;
 
-    fileSystems."/" = mkIf (!cfg.zfs.enable) {
+    fileSystems."/" = mkIf (!cfg.zfs.enable) lib.mkDefault {
       device = "/dev/disk/by-label/nixos";
       fsType = "ext4";
       autoResize = true;
     };
 
-    fileSystems."/boot" = mkIf (cfg.efi || cfg.zfs.enable) {
+    fileSystems."/boot" = mkIf (cfg.efi || cfg.zfs.enable) lib.mkDefault {
       # The ZFS image uses a partition labeled ESP whether or not we're
       # booting with EFI.
       device = "/dev/disk/by-label/ESP";