Index: core/stackless_impl.h
===================================================================
--- core/stackless_impl.h	(revision 54420)
+++ core/stackless_impl.h	(working copy)
@@ -91,6 +91,9 @@
 					      PyObject *retval);
 PyAPI_FUNC(PyObject *) PyEval_EvalFrame_iter(struct _frame *f,  int throwflag,
 					     PyObject *retval);
+/* not strictly an API function, but needs to be for the purpose of pickling */
+PyAPI_FUNC(PyObject *) channel_seq_callback(struct _frame *f,  int throwflag,
+					     PyObject *retval);
 
 /* rebirth of software stack avoidance */
 
Index: pickling/prickelpit.c
===================================================================
--- pickling/prickelpit.c	(revision 54420)
+++ pickling/prickelpit.c	(working copy)
@@ -719,6 +719,7 @@
 DEF_INVALID_EXEC(eval_frame_value)
 DEF_INVALID_EXEC(eval_frame_noval)
 DEF_INVALID_EXEC(eval_frame_iter)
+DEF_INVALID_EXEC(channel_seq_callback)
 
 static PyTypeObject wrap_PyFrame_Type;
 
@@ -1048,6 +1049,8 @@
 				 PyEval_EvalFrame_noval, REF_INVALID_EXEC(eval_frame_noval))
 	    || slp_register_execute(&PyFrame_Type, "eval_frame_iter",
 				 PyEval_EvalFrame_iter, REF_INVALID_EXEC(eval_frame_iter))
+	    || slp_register_execute(&PyCFrame_Type, "channel_seq_callback",
+				 channel_seq_callback, REF_INVALID_EXEC(channel_seq_callback))
 	    || init_type(&wrap_PyFrame_Type, initchain);
 }
 #undef initchain