diff --git a/pkgs/tools/X11/xidlehook/default.nix b/pkgs/tools/X11/xidlehook/default.nix
index a71531eebc5..e5717f7f7d4 100644
--- a/pkgs/tools/X11/xidlehook/default.nix
+++ b/pkgs/tools/X11/xidlehook/default.nix
@@ -17,7 +17,7 @@ rustPlatform.buildRustPackage rec {
   buildInputs = [ x11 xorg.libXScrnSaver libpulseaudio ];
   nativeBuildInputs = [ pkgconfig patchelf ];
 
-  postFixup = ''
+  postFixup = lib.optionalString stdenv.isLinux ''
     RPATH="$(patchelf --print-rpath $out/bin/xidlehook)"
     patchelf --set-rpath "$RPATH:${libpulseaudio}/lib" $out/bin/xidlehook
   '';