diff --git a/modules/disko.nix b/modules/disko.nix
index b9302e71..1e249a04 100644
--- a/modules/disko.nix
+++ b/modules/disko.nix
@@ -65,7 +65,7 @@ in
       (lib.attrNames cfg.disks);
 
     disko = {
-      devices = lib.mkIf (cfg.disks != [ ]) (lib.head (map
+      devices = lib.mkIf (cfg.disks != null) (lib.head (map
         (disk:
           let
             diskName = if disk.name != "" then "-${disk.name}" else "";