diff -r 70274d53c1dd Modules/readline.c
--- a/Modules/readline.c	Mon Apr 09 19:04:04 2012 -0400
+++ b/Modules/readline.c	Fri Oct 26 14:12:33 2012 +0200
@@ -804,7 +804,7 @@
     if (completer != NULL) {
         PyObject *r;
 #ifdef WITH_THREAD
-        PyGILState_STATE gilstate = PyGILState_Ensure();
+        PyEval_RestoreThread(_PyOS_ReadlineTState);
 #endif
         rl_attempted_completion_over = 1;
         r = PyObject_CallFunction(completer, "si", text, state);
@@ -826,7 +826,7 @@
         Py_XDECREF(r);
       done:
 #ifdef WITH_THREAD
-        PyGILState_Release(gilstate);
+        PyEval_SaveThread();
 #endif
         return result;
     }