diff --git a/nixos/tests/nextcloud/default.nix b/nixos/tests/nextcloud/default.nix
index af5f4cd5fed9..fa5126610c7e 100644
--- a/nixos/tests/nextcloud/default.nix
+++ b/nixos/tests/nextcloud/default.nix
@@ -80,7 +80,7 @@ let
               "${test-helpers.rclone} ${test-helpers.check-sample}"
           )
 
-      ${if builtins.isFunction test-helpers.extraTests then test-helpers.extraTests args else test-helpers.extraTests}
+      ${if pkgs.lib.isFunction test-helpers.extraTests then test-helpers.extraTests args else test-helpers.extraTests}
     '';
   };