diff --git a/nixos/modules/misc/nixpkgs.nix b/nixos/modules/misc/nixpkgs.nix
index e0c192246c0c..afb74581e239 100644
--- a/nixos/modules/misc/nixpkgs.nix
+++ b/nixos/modules/misc/nixpkgs.nix
@@ -19,7 +19,7 @@ let
       lhs = optCall lhs_ { inherit pkgs; };
       rhs = optCall rhs_ { inherit pkgs; };
     in
-    lhs // rhs //
+    recursiveUpdate lhs rhs //
     optionalAttrs (lhs ? packageOverrides) {
       packageOverrides = pkgs:
         optCall lhs.packageOverrides pkgs //