diff --git a/configuration/common/nix.nix b/configuration/common/nix.nix
index 8ae4666..f0a1837 100644
--- a/configuration/common/nix.nix
+++ b/configuration/common/nix.nix
@@ -62,7 +62,7 @@
     };
   };
 
-  nix.package = pkgs.nixVersions.nix_2_18;
+  nix.package = lib.mkDefault pkgs.nixVersions.nix_2_18;
 
   documentation.doc.enable = false;