diff --git a/roles/nix-mio-ops.nix b/roles/nix-mio-ops.nix
index 81cfafa..bac074f 100644
--- a/roles/nix-mio-ops.nix
+++ b/roles/nix-mio-ops.nix
@@ -9,7 +9,7 @@
         maxJobs = 64;
         sshKey = "/root/.ssh/id_nixops_ed25519";
         sshUser = "craige";
-        system = "x86-64";
+        system = "x86_64-linux";
         supportedFeatures = [ "big-parallel" ];
       }
     ];