diff --git a/nixops/rpi.nix b/nixops/rpi.nix
index e72ef2e..dad6963 100644
--- a/nixops/rpi.nix
+++ b/nixops/rpi.nix
@@ -58,6 +58,13 @@ in
     nix = {
       isNormalUser = true;
     };
+    nixbld = {
+      isNormalUser = true;
+      extraGroups = ["plugdev" "dialout"];
+      openssh.authorizedKeys.keys = [
+        "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCxqGdllmXCeadFvqhpWpPfeh/sSiORxCJQO6wCEnkctoYYn9chegj5tXz5dm7WvXQt73pFMytyXBXKidMMXpW2pTxLXVt3tV2rWf1MspznyMHND1xJTXZzPvmF3YiwMvJ2UkLCiW0ixlKn4z30rcsC+jn+aunNo8lsRCNeIIhHpe1JollM05w2YXE0/BUXTXDpqBXWPPvs0GdsSecwWMMhwvVQAFyms1aSevEPADrHa6Zbk8+MnS5FMFrPiJc8RSEsPkG0OOsAG1gWFyKqT5nXHpgcK1AjO5YOlBKfj//b8yLppP3BRmvnulnAJ9+uscWfzxi3cdofgcl4sT/J16Dh hydra-queue-runner@nixbld"
+      ];
+    };
   };
   security.sudo.wheelNeedsPassword = false;
   services.udev.packages = [ m-labs.openocd ];