diff --git a/pkgs/by-name/lc/lcms2/package.nix b/pkgs/by-name/lc/lcms2/package.nix
index 89b0d2434e4c..bdb1ba358a73 100644
--- a/pkgs/by-name/lc/lcms2/package.nix
+++ b/pkgs/by-name/lc/lcms2/package.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
   ];
 
   # See https://trac.macports.org/ticket/60656
-  LDFLAGS = if stdenv.hostPlatform.isDarwin then "-Wl,-w" else null;
+  env = lib.optionalAttrs stdenv.hostPlatform.isDarwin { LDFLAGS = "-Wl,-w"; };
 
   meta = {
     description = "Color management engine";