diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 7a08c4a1940..89c53d32618 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -10536,6 +10536,8 @@ let
   ujson = buildPythonPackage rec {
     name = "ujson-1.33";
 
+    disabled = isPyPy;
+
     src = fetchurl {
       url = "https://pypi.python.org/packages/source/u/ujson/${name}.zip";
       md5 = "8148a2493fff78940feab1e11dc0a893";