diff --git a/Include/pystate.h b/Include/pystate.h
index 9b61ad7..d4233bf 100644
--- a/Include/pystate.h
+++ b/Include/pystate.h
@@ -67,6 +67,8 @@
 
     PyObject *dict;
 
+    int tick_counter;
+
     /* XXX signal handlers should also be here */
 
 } PyThreadState;
@@ -105,6 +107,9 @@
 PyAPI_FUNC(PyThreadState *) PyInterpreterState_ThreadHead(PyInterpreterState *);
 PyAPI_FUNC(PyThreadState *) PyThreadState_Next(PyThreadState *);
 
+/* hook for PyEval_GetFrame(), requested for Psyco */
+PyAPI_DATA(unaryfunc) _PyThreadState_GetFrame;
+
 #ifdef __cplusplus
 }
 #endif