diff --git a/nixos/modules/rename.nix b/nixos/modules/rename.nix
index eb10d4f428b..473a832c650 100644
--- a/nixos/modules/rename.nix
+++ b/nixos/modules/rename.nix
@@ -198,6 +198,8 @@ with lib;
       "See the 16.09 release notes for more information.")
     (mkRemovedOptionModule [ "services" "phpfpm" "phpIni" ] "")
     (mkRemovedOptionModule [ "services" "dovecot2" "package" ] "")
+    (mkRemovedOptionModule [ "services" "firefox" "syncserver" "user" ] "")
+    (mkRemovedOptionModule [ "services" "firefox" "syncserver" "group" ] "")
     (mkRemovedOptionModule [ "fonts" "fontconfig" "hinting" "style" ] "")
     (mkRemovedOptionModule [ "services" "xserver" "displayManager" "sddm" "themes" ]
       "Set the option `services.xserver.displayManager.sddm.package' instead.")