diff --git a/pkgs/applications/misc/audio/sox/default.nix b/pkgs/applications/misc/audio/sox/default.nix
index 60e8a3fe029c..1b8e0541346a 100644
--- a/pkgs/applications/misc/audio/sox/default.nix
+++ b/pkgs/applications/misc/audio/sox/default.nix
@@ -59,8 +59,6 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [
     autoreconfHook
     autoconf-archive
-  ] ++ lib.optionals enableOpusfile [
-    # configure.ac uses pkg-config only to locate libopusfile
     pkg-config
   ];