diff --git a/src/QUI/ERP/Accounting/PriceFactors/FactorList.php b/src/QUI/ERP/Accounting/PriceFactors/FactorList.php
index a6bb331ae69166c836a93fbadf01f7db5fe9459f..ac53aea8c5cff7e850f54fa0df0e4d2f185f351c 100644
--- a/src/QUI/ERP/Accounting/PriceFactors/FactorList.php
+++ b/src/QUI/ERP/Accounting/PriceFactors/FactorList.php
@@ -97,7 +97,7 @@ public function toJSON(): string
      *
      * @return ArrayIterator|Traversable
      */
-    public function getIterator()
+    public function getIterator(): \Traversable
     {
         return new ArrayIterator($this->list);
     }