diff --git a/application/Espo/Entities/Notification.php b/application/Espo/Entities/Notification.php
index 52d1e25d2f..83d483c47b 100644
--- a/application/Espo/Entities/Notification.php
+++ b/application/Espo/Entities/Notification.php
@@ -185,7 +185,7 @@ class Notification extends Entity
         return $this->get('actionId');
     }
 
-    public function setGroupedCount(?string $groupedCount): self
+    public function setGroupedCount(?int $groupedCount): self
     {
         return $this->set('groupedCount', $groupedCount);
     }