Index: Python/bltinmodule.c
===================================================================
--- Python/bltinmodule.c	(revision 47245)
+++ Python/bltinmodule.c	(working copy)
@@ -2384,7 +2384,9 @@
 
 		if (tuple->ob_type->tp_as_sequence &&
 		    tuple->ob_type->tp_as_sequence->sq_item) {
+			_PyObject_GC_UNTRACK(result);
 			item = tuple->ob_type->tp_as_sequence->sq_item(tuple, i);
+			_PyObject_GC_TRACK(result);
 			if (item == NULL)
 				goto Fail_1;
 		} else {