diff --git a/modules/boxes.nix b/modules/boxes.nix
index d973ab8..7d7efdf 100644
--- a/modules/boxes.nix
+++ b/modules/boxes.nix
@@ -1,14 +1,24 @@
 { config, pkgs, ... }:
 {
-  # https://nixos.wiki/wiki/Libvirt
+  # View log since last boot:
+  #   journalctl -b SYSLOG_IDENTIFIER=org.gnome.Boxes
+
+  # Open issue: HiDPI support. https://gitlab.gnome.org/GNOME/gnome-boxes/-/issues/635
 
-  # libvirt is a dependency of GNOME Boxes
-  virtualisation.libvirtd.enable = true;
   users.users.yoda = {
-    extraGroups = [ "libvirtd" ];
-
     packages = with pkgs; [
       gnome.gnome-boxes # Virtual machines
     ];
   };
+
+  # libvirt is a dependency of GNOME Boxes
+  # https://nixos.wiki/wiki/Libvirt
+  virtualisation.libvirtd.enable = true;
+  users.users.yoda.extraGroups = [ "libvirtd" ];
+
+  # Required for USB redirection to work, see
+  #   https://github.com/NixOS/nixpkgs/issues/39129#issuecomment-382569032
+  #   https://www.reddit.com/r/NixOS/comments/177wcyi/comment/k4vok4n/
+  security.polkit.enable = true;
+  virtualisation.spiceUSBRedirection.enable = true;
 }