diff --git a/pkgs/development/python-modules/txtorcon/default.nix b/pkgs/development/python-modules/txtorcon/default.nix
index 93c01fe7acb2..c2c0fb941fae 100644
--- a/pkgs/development/python-modules/txtorcon/default.nix
+++ b/pkgs/development/python-modules/txtorcon/default.nix
@@ -1,6 +1,6 @@
 {lib, buildPythonPackage, fetchPypi, isPy3k, incremental, ipaddress, twisted
 , automat, zope_interface, idna, pyopenssl, service-identity, pytest, mock, lsof
-, GeoIP}:
+, GeoIP, isPy27}:
 
 buildPythonPackage rec {
   pname = "txtorcon";
@@ -28,6 +28,9 @@ buildPythonPackage rec {
     description = "Twisted-based Tor controller client, with state-tracking and configuration abstractions";
     homepage = https://github.com/meejah/txtorcon;
     maintainers = with lib.maintainers; [ jluttine ];
+    # Currently broken on Python 2.7. See
+    # https://github.com/NixOS/nixpkgs/issues/71826
+    broken = isPy27;
     license = lib.licenses.mit;
   };
 }