diff --git a/nixos/modules/services/networking/firefox/sync-server.nix b/nixos/modules/services/networking/firefox/sync-server.nix
index 6ed7a6beb9e..79f32f3358c 100644
--- a/nixos/modules/services/networking/firefox/sync-server.nix
+++ b/nixos/modules/services/networking/firefox/sync-server.nix
@@ -119,7 +119,7 @@ in
     };
   };
 
-  config = {
+  config = mkIf cfg.enable {
 
     systemd.services.syncserver = {
       after = [ "network.target" ];