diff --git a/nixos/lib/testing-python.nix b/nixos/lib/testing-python.nix
index c9d4f0f0861..99d0a9a0bfa 100644
--- a/nixos/lib/testing-python.nix
+++ b/nixos/lib/testing-python.nix
@@ -130,7 +130,13 @@ rec {
               {
                 virtualisation.qemu.package = qemu_pkg;
               }
-            );
+            ) ++ [(
+              {
+                # Ensure we do not use aliases. Ideally this is only set
+                # when the test framework is used by Nixpkgs NixOS tests.
+                nixpkgs.config.allowAliases = false;
+              }
+            )];
           };
 
           # FIXME: get this pkg from the module system
diff --git a/nixos/tests/make-test-python.nix b/nixos/tests/make-test-python.nix
index 89897fe7e61..7a96f538d8d 100644
--- a/nixos/tests/make-test-python.nix
+++ b/nixos/tests/make-test-python.nix
@@ -1,6 +1,6 @@
 f: {
   system ? builtins.currentSystem,
-  pkgs ? import ../.. { inherit system; config = {}; },
+  pkgs ? import ../.. { inherit system; },
   ...
 } @ args: