diff --git a/Modules/cPickle.c b/Modules/cPickle.c
index 4e53ae6..331fca2 100644
--- a/Modules/cPickle.c
+++ b/Modules/cPickle.c
@@ -4033,7 +4033,7 @@
 	*/
 	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;