diff --git a/modules/tasks/filesystems.nix b/modules/tasks/filesystems.nix
index 6ed59916ccdc..bc918a5935b0 100644
--- a/modules/tasks/filesystems.nix
+++ b/modules/tasks/filesystems.nix
@@ -7,7 +7,6 @@ let
   options = {
 
     fileSystems = pkgs.lib.mkOption {
-      default = null;
       example = [
         { mountPoint = "/";
           device = "/dev/hda1";