diff --git a/src/day.c b/src/day.c
index 50d6639..96b863a 100644
--- a/src/day.c
+++ b/src/day.c
@@ -52,6 +52,7 @@ static void day_free(struct day_item *day)
 
 static void day_init_vector(void)
 {
+	day_items_nb = 0;
 	VECTOR_INIT(&day_items, 16);
 }