diff --git a/pkgs/tools/networking/cbftp/default.nix b/pkgs/tools/networking/cbftp/default.nix
index e78b8a93dc6..5709acb02dd 100644
--- a/pkgs/tools/networking/cbftp/default.nix
+++ b/pkgs/tools/networking/cbftp/default.nix
@@ -21,6 +21,8 @@ stdenv.mkDerivation rec {
 
   dontConfigure = true;
 
+  makeFlags = lib.optional stdenv.isDarwin "OPTFLAGS=-O0";
+
   installPhase = ''
     runHook preInstall