diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index e4ff3b6968a3..d080e913399c 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5134,7 +5134,7 @@ pythonPackages = python.modules // rec {
   });
 
   twisted = buildPythonPackage rec {
-    name = "twisted-12.3.0";
+    name = "twisted-10.2.0";
 
     src = fetchurl {
       url = http://tmrc.mit.edu/mirror/twisted/Twisted/10.2/Twisted-10.2.0.tar.bz2;