diff --git a/users/grfn/system/system/modules/common.nix b/users/grfn/system/system/modules/common.nix
index 6a8cce7d9..91723973f 100644
--- a/users/grfn/system/system/modules/common.nix
+++ b/users/grfn/system/system/modules/common.nix
@@ -76,4 +76,12 @@ with lib;
   ];
 
   services.pcscd.enable = true;
+
+  services.udev.extraRules = ''
+    # UDEV rules for Teensy USB devices
+    ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789B]?", ENV{ID_MM_DEVICE_IGNORE}="1"
+    ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789A]?", ENV{MTP_NO_PROBE}="1"
+    SUBSYSTEMS=="usb", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789ABCD]?", MODE:="0666"
+    KERNEL=="ttyACM*", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789B]?", MODE:="0666"
+  '';
 }