diff --git a/nixos/maintainers/scripts/ec2/amazon-image.nix b/nixos/maintainers/scripts/ec2/amazon-image.nix
index b05467fb9b8..653744986d1 100644
--- a/nixos/maintainers/scripts/ec2/amazon-image.nix
+++ b/nixos/maintainers/scripts/ec2/amazon-image.nix
@@ -41,8 +41,7 @@ in {
 
     sizeMB = mkOption {
       type = with types; either (enum [ "auto" ]) int;
-      # TODO(lukegb): this should be "auto"; see #120473
-      default = if config.ec2.hvm then 2048 else 8192;
+      default = "auto";
       example = 8192;
       description = "The size in MB of the image";
     };