diff --git a/pkgs/by-name/ex/extractpdfmark/package.nix b/pkgs/by-name/ex/extractpdfmark/package.nix
index fd4820b872bc..2d9a6b97cbf8 100644
--- a/pkgs/by-name/ex/extractpdfmark/package.nix
+++ b/pkgs/by-name/ex/extractpdfmark/package.nix
@@ -24,6 +24,10 @@ stdenv.mkDerivation rec {
     ./gettext-0.25.patch
   ];
 
+  env = lib.optionalAttrs stdenv.hostPlatform.isDarwin {
+    NIX_LDFLAGS = "-liconv";
+  };
+
   strictDeps = true;
 
   nativeBuildInputs = [