diff --git a/morph/lib/issuer-aws.nix b/morph/lib/issuer-aws.nix
index 15ae9cda47d22c753b964ebe9fe9f68f27f77e3b..3febd796b3eceb5a2da73e4874d52d50767da947 100644
--- a/morph/lib/issuer-aws.nix
+++ b/morph/lib/issuer-aws.nix
@@ -1,5 +1,10 @@
-{
+{ lib, ... }: {
   imports = [ <nixpkgs/nixos/modules/virtualisation/amazon-image.nix> ];
+
+  # amazon-image.nix isn't quite aware of nvme-attached storage so give it a
+  # little help configuring grub.
+  boot.loader.grub.device = lib.mkForce "/dev/nvme0n1";
+
   ec2.hvm = true;
   boot.kernel.sysctl = { "vm.swappiness" = 0; };
   swapDevices = [ {