diff --git a/pkgs/top-level/node-packages.nix b/pkgs/top-level/node-packages.nix
index 03f85af3c0d9..a23b776d1120 100644
--- a/pkgs/top-level/node-packages.nix
+++ b/pkgs/top-level/node-packages.nix
@@ -12,7 +12,7 @@ let
         };
         full = [ {
           name = pkg.fullName;
-          value = buildNodePackage rec {
+          value = pkgs.lib.makeOverridable buildNodePackage rec {
             name = "${pkg.baseName}-${pkg.version}";
             src = (if pkg.patchLatest then patchLatest else fetchurl) {
               url = "http://registry.npmjs.org/${pkg.baseName}/-/${name}.tgz";