diff --git a/pkgs/applications/audio/csound/default.nix b/pkgs/applications/audio/csound/default.nix
index 6afddb467d0d..ac8303955f9e 100644
--- a/pkgs/applications/audio/csound/default.nix
+++ b/pkgs/applications/audio/csound/default.nix
@@ -31,8 +31,7 @@ stdenv.mkDerivation rec {
   };
 
   cmakeFlags = [ "-DBUILD_CSOUND_AC=0" ] # fails to find Score.hpp
-    ++ lib.optional stdenv.isDarwin "-DCS_FRAMEWORK_DEST=${placeholder "out"}/lib"
-    ++ lib.optional (libjack2 != null) "-DJACK_HEADER=${libjack2}/include/jack/jack.h";
+    ++ lib.optional stdenv.isDarwin "-DCS_FRAMEWORK_DEST=${placeholder "out"}/lib";
 
   nativeBuildInputs = [ cmake flex bison gettext ];
   buildInputs = [ libsndfile libsamplerate boost ]