diff --git a/nixops/common-users.nix b/nixops/common-users.nix
index af52619..b8162a2 100644
--- a/nixops/common-users.nix
+++ b/nixops/common-users.nix
@@ -20,6 +20,13 @@
     ];
   };
 
+  guest = {
+    isNormalUser = true;
+    extraGroups = ["plugdev" "dialout"];
+    openssh.authorizedKeys.keys = [
+      "ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBPsv4UMEFV0UHeHdA9R3sC+qoMxrqhcuFqwqWMI4AF/lixwcbRyA8QKiu/7R22m2u6pp+Zk6hYqcxdgClI4uN2oQhVjJX6wEgfT94vC/67OKJI/NNVsR8G0lr0ufCo4Lbw=="
+    ];
+  };
   harry = {
     isNormalUser = true;
     extraGroups = ["plugdev" "dialout" "wireshark" "libvirtd"];