diff --git a/pkgs/development/python-modules/trezor/default.nix b/pkgs/development/python-modules/trezor/default.nix
index 9a6a3c39eec1..0f96b100435a 100644
--- a/pkgs/development/python-modules/trezor/default.nix
+++ b/pkgs/development/python-modules/trezor/default.nix
@@ -1,11 +1,13 @@
 { lib, fetchPypi, buildPythonPackage,
-  protobuf, hidapi, ecdsa, mnemonic, requests, pyblake2, click, libusb1, rlp
+  protobuf, hidapi, ecdsa, mnemonic, requests, pyblake2, click, libusb1, rlp, isPy3k
 }:
 
 buildPythonPackage rec {
   pname = "trezor";
   version = "0.9.1";
 
+  disabled = !isPy3k;
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "a481191011bade98f1e9f1201e7c72a83945050657bbc90dc4ac32dc8b8b46a4";