1 files changed, 3 insertions, 3 deletions
diff --git a/pkgs/misc/jackaudio/jack1.nix b/pkgs/misc/jackaudio/jack1.nix
index 848215ae17af..c11be4ad0c0c 100644
--- a/pkgs/misc/jackaudio/jack1.nix
+++ b/pkgs/misc/jackaudio/jack1.nix
@@ -22,9 +22,9 @@ stdenv.mkDerivation rec {
     sha256 = "0i6l25dmfk2ji2lrakqq9icnwjxklgcjzzk65dmsff91z2zva5rm";
   };
   
-  configureFlags = ''
-    ${if (optLibffado != null) then "--enable-firewire" else ""}
-  '';
+  configureFlags = [
+    (stdenv.lib.enableFeature (optLibffado != null) "firewire")
+  ];
 
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ optAlsaLib optDb optLibffado optCelt ];