Index: Modules/cPickle.c
===================================================================
--- Modules/cPickle.c	(révision 76700)
+++ Modules/cPickle.c	(copie de travail)
@@ -4117,7 +4117,7 @@
 	*/
 	if (self->num_marks > 0 && self->marks[self->num_marks - 1] == len) {
 		self->num_marks--;
-	} else if (len >= 0) {
+	} else if (len > 0) {
 		len--;
 		Py_DECREF(self->stack->data[len]);
 		self->stack->length = len;