diff --git a/pkgs/development/libraries/libnatspec/default.nix b/pkgs/development/libraries/libnatspec/default.nix
index 985745c38986..7dafe3434f9f 100644
--- a/pkgs/development/libraries/libnatspec/default.nix
+++ b/pkgs/development/libraries/libnatspec/default.nix
@@ -17,7 +17,6 @@ stdenv.mkDerivation (rec {
     maintainers = [ stdenv.lib.maintainers.urkud ];
   };
 } // stdenv.lib.optionalAttrs (!stdenv.isLinux) {
-  NIX_CFLAGS_COMPILE = "-I${libiconv}/include";
-
-  NIX_CFLAGS_LINK = "-L${libiconv}/lib -liconv";
+  NIX_LDFLAGS = "-liconv";
+  propagatedBuildInputs = [ libiconv ];
 })