diff --git a/pkgs/os-specific/linux/rtkit/default.nix b/pkgs/os-specific/linux/rtkit/default.nix
index 059b09449619..78bcd925aea0 100644
--- a/pkgs/os-specific/linux/rtkit/default.nix
+++ b/pkgs/os-specific/linux/rtkit/default.nix
@@ -34,6 +34,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ dbus libcap ];
+  NIX_LDFLAGS = [ "-lrt" ];
 
   meta = with stdenv.lib; {
     homepage = http://0pointer.de/blog/projects/rtkit;