diff --git a/tests/nixos/default.nix b/tests/nixos/default.nix
index 3e2d20a71..f0b1a8865 100644
--- a/tests/nixos/default.nix
+++ b/tests/nixos/default.nix
@@ -94,13 +94,6 @@ let
       );
     };
 
-  otherNixes.nix_2_18.setNixPackage =
-    { lib, pkgs, ... }:
-    {
-      imports = [ checkOverrideNixVersion ];
-      nix.package = lib.mkForce pkgs.nixVersions.nix_2_18;
-    };
-
 in
 
 {