diff --git a/pkgs/development/libraries/opensaml-cpp/default.nix b/pkgs/development/libraries/opensaml-cpp/default.nix
index 28a8ab838c5..327956f8a7d 100644
--- a/pkgs/development/libraries/opensaml-cpp/default.nix
+++ b/pkgs/development/libraries/opensaml-cpp/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   configureFlags = [ "--with-xmltooling=${xml-tooling-c}" ];
 
-  env.NIX_CFLAGS_COMPILE = toString [ "-std=c++14" ];
+  env.NIX_CFLAGS_COMPILE = lib.optionalString (!stdenv.isDarwin) "-std=c++14";
 
   enableParallelBuilding = true;