diff --git a/otto.scm b/otto.scm
index 5bc3487..439c54f 100644
--- a/otto.scm
+++ b/otto.scm
@@ -25,8 +25,15 @@
                                             (substitute-urls (append (list
                                                                       "https://substitutes.nonguix.org")
                                                               %default-substitute-urls))
-                                            (authorized-keys (append (list (local-file
-                                                                            "./signing-key.pub"))
+                                            (authorized-keys (append (list (plain-file
+                                                                            "./signing-key.pub"
+                                                                            "(public-key 
+ (ecc 
+  (curve Ed25519)
+  (q #C1FD53E5D4CE971933EC50C9F307AE2171A2D3B52C804642A7A35F84F3A4EA98#)
+  )
+ )
+"))
                                                               %default-authorized-guix-keys))))))
   (swap-devices (list (swap-space
                         (target (file-system-label "otto-swap")))))