diff --git a/pkgs/development/interpreters/python/pypy/2.7/default.nix b/pkgs/development/interpreters/python/pypy/2.7/default.nix
index 5769ed63727..2b9c3f5958b 100644
--- a/pkgs/development/interpreters/python/pypy/2.7/default.nix
+++ b/pkgs/development/interpreters/python/pypy/2.7/default.nix
@@ -79,17 +79,6 @@ in stdenv.mkDerivation rec {
 
   setupHook = python-setup-hook sitePackages;
 
-  postBuild = ''
-    pushd ./lib_pypy
-    ../pypy-c ./_audioop_build.py
-    ../pypy-c ./_curses_build.py
-    ../pypy-c ./_pwdgrp_build.py
-    ../pypy-c ./_sqlite3_build.py
-    ../pypy-c ./_syslog_build.py
-    ../pypy-c ./_tkinter/tklib_build.py
-    popd
-  '';
-
   doCheck = true;
   checkPhase = ''
     export TERMINFO="${ncurses.out}/share/terminfo/";