diff --git a/pkgs/development/python-modules/nix-kernel/default.nix b/pkgs/development/python-modules/nix-kernel/default.nix
index 81057308e6b..5758e60fa3f 100644
--- a/pkgs/development/python-modules/nix-kernel/default.nix
+++ b/pkgs/development/python-modules/nix-kernel/default.nix
@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchFromGitHub
+, isPy3k
 , pexpect
 , notebook
 , nix
@@ -10,6 +11,8 @@ buildPythonPackage rec {
   pname = "nix-kernel";
   version = "unstable-2020-04-26";
 
+  disabled = !isPy3k;
+
   src = fetchFromGitHub {
     owner = "GTrunSec";
     repo = "nix-kernel";