diff --git a/pkgs/development/tools/build-managers/gnumake/default.nix b/pkgs/development/tools/build-managers/gnumake/default.nix
index fb9dab54049a..8e0095bb819e 100644
--- a/pkgs/development/tools/build-managers/gnumake/default.nix
+++ b/pkgs/development/tools/build-managers/gnumake/default.nix
@@ -1,6 +1,4 @@
-{ lib, stdenv, fetchurl, guileSupport ? false, pkg-config ? null , guile ? null }:
-
-assert guileSupport -> ( pkg-config != null && guile != null );
+{ lib, stdenv, fetchurl, guileSupport ? false, pkg-config, guile }:
 
 let
   version = "4.3";