diff --git a/src/list/sort.c b/src/list/sort.c
index 037881f..8b927b4 100644
--- a/src/list/sort.c
+++ b/src/list/sort.c
@@ -34,7 +34,7 @@ void list_sort(list_t* x) {
             lnode_t *p = l->prev;
 
             for (lnode_t* c = l; c != r; c = c->next) {
-                if (lnode_compare(c, r) < 0) {
+                if (lnode_compare(c, r) <= 0) {
                     p = (is_null(p)) ? l : p->next;
                     lnode_swap(p, c);
                 }