diff --git a/pkgs/applications/networking/instant-messengers/utox/default.nix b/pkgs/applications/networking/instant-messengers/utox/default.nix
index a5f0f5cef61..ccb4244d626 100644
--- a/pkgs/applications/networking/instant-messengers/utox/default.nix
+++ b/pkgs/applications/networking/instant-messengers/utox/default.nix
@@ -25,8 +25,6 @@ stdenv.mkDerivation rec {
 
   doCheck = false;
 
-  makeFlags = "PREFIX=$(out)";
-
   meta = with stdenv.lib; {
     description = "Lightweight Tox client";
     license = licenses.gpl3;