diff --git a/nixos/agares/configuration.nix b/nixos/agares/configuration.nix
index 77cb0a1..986a236 100644
--- a/nixos/agares/configuration.nix
+++ b/nixos/agares/configuration.nix
@@ -17,7 +17,10 @@
   boot.loader.grub.version = 2;
   boot.loader.grub.device = "/dev/sda";
 
-  boot.kernelParams = [ "console=ttyS0,115200" ];
+  boot.kernelParams = [
+    "console=ttyS0,115200"
+    "amd_iommu=on"
+  ];
 
   i18n.defaultLocale = "en_US.UTF-8";
   console = {