diff --git a/nixos/modules/virtualisation/docker.nix b/nixos/modules/virtualisation/docker.nix
index 0e1b9206999..7288cf29875 100644
--- a/nixos/modules/virtualisation/docker.nix
+++ b/nixos/modules/virtualisation/docker.nix
@@ -129,8 +129,7 @@ in
           LimitNPROC = 1048576;
         } // proxy_env;
 
-        path = [ pkgs.kmod ] ++
-          (if cfg.storageDriver == "zfs" then [ pkgs.zfs ] else []);
+        path = [ pkgs.kmod ] ++ (optional (cfg.storageDriver == "zfs") pkgs.zfs);
         environment.MODULE_DIR = "/run/current-system/kernel-modules/lib/modules";
 
         postStart = cfg.postStart;