diff --git a/pkgs/development/python-modules/cupy/default.nix b/pkgs/development/python-modules/cupy/default.nix
index 2983255e8f9..5c9a5b76d10 100644
--- a/pkgs/development/python-modules/cupy/default.nix
+++ b/pkgs/development/python-modules/cupy/default.nix
@@ -7,6 +7,7 @@
 buildPythonPackage rec {
   pname = "cupy";
   version = "8.1.0";
+  disabled = !isPy3k;
 
   src = fetchPypi {
     inherit pname version;