diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index 60b6e45..3a981f1 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -148,6 +148,8 @@ in
         iptables -w -A block-insecure-devices -m mac --mac-source 00:19:af:5b:dd:58 -j DROP  # power supply
         iptables -w -A block-insecure-devices -m mac --mac-source 28:58:be:dc:66:1f -j DROP  # hikvision low-cost 780nm laser viewer
         iptables -w -A block-insecure-devices -m mac --mac-source bc:99:11:a4:d2:ac -j DROP  # zyxel cloud switch
+        iptables -w -A block-insecure-devices -m mac --mac-source d8:9c:67:ab:83:e7 -j DROP  # HP printer, wifi
+        iptables -w -A block-insecure-devices -m mac --mac-source f4:39:09:f7:3c:d7 -j DROP  # HP printer, ethernet
         iptables -w -A FORWARD -j block-insecure-devices
       '';
       extraStopCommands = ''