diff --git a/pkgs/development/python-modules/seqdiag/default.nix b/pkgs/development/python-modules/seqdiag/default.nix
index 052c2fc3d0f..feddc24985a 100644
--- a/pkgs/development/python-modules/seqdiag/default.nix
+++ b/pkgs/development/python-modules/seqdiag/default.nix
@@ -1,10 +1,11 @@
-{ stdenv, fetchurl, buildPythonPackage, pep8, nose, unittest2, docutils
+{ stdenv, fetchurl, buildPythonPackage, isPy27, pep8, nose, unittest2, docutils
 , blockdiag
 }:
 
 buildPythonPackage rec {
   pname = "seqdiag";
   version = "2.0.0";
+  disabled = isPy27;
 
   src = fetchurl {
     url = "mirror://pypi/s/seqdiag/${pname}-${version}.tar.gz";