diff --git a/pkgs/games/doom-ports/slade/default.nix b/pkgs/games/doom-ports/slade/default.nix
index a388922e168a..0c27d2c48223 100644
--- a/pkgs/games/doom-ports/slade/default.nix
+++ b/pkgs/games/doom-ports/slade/default.nix
@@ -52,6 +52,7 @@ stdenv.mkDerivation rec {
 
   cmakeFlags = [
     "-DwxWidgets_LIBRARIES=${wxGTK}/lib"
+    (lib.cmakeFeature "CL_WX_CONFIG" (lib.getExe' (lib.getDev wxGTK) "wx-config"))
   ];
 
   env.NIX_CFLAGS_COMPILE = "-Wno-narrowing";