diff --git a/containers/mautrix-facebook.nix b/containers/mautrix-facebook.nix
index d45ead5..4817f95 100644
--- a/containers/mautrix-facebook.nix
+++ b/containers/mautrix-facebook.nix
@@ -27,7 +27,8 @@ nglib.makeSystem {
               cp ${config} "$CONFIG_FILE" ; chmod 755 "$CONFIG_FILE"
               ${pkgs.sqlite}/bin/sqlite3 $DB_FILE '.databases ; .quit'
 
-              ${pkgs.mautrix-facebook}/bin/mautrix-facebook -c "$CONFIG_FILE" -r "$REGISTRATION_FILE" -g
+              [ -e "$REGISTRATION_FILE" ] || \
+                ${pkgs.mautrix-facebook}/bin/mautrix-facebook -c "$CONFIG_FILE" -r "$REGISTRATION_FILE" -g
               ${pkgs.mautrix-facebook}/bin/mautrix-facebook -c "$CONFIG_FILE" -r "$REGISTRATION_FILE" -n
             '';
       };