diff --git a/src/BlockEntities/ChestEntity.h b/src/BlockEntities/ChestEntity.h
index 8ead8bda0..6eb72fc77 100644
--- a/src/BlockEntities/ChestEntity.h
+++ b/src/BlockEntities/ChestEntity.h
@@ -55,7 +55,7 @@ private:
 	int m_NumActivePlayers;
 
 	/** cItemGrid::cListener overrides: */
-	virtual void OnSlotChanged(cItemGrid * a_Grid, int a_SlotNum)
+	virtual void OnSlotChanged(cItemGrid * a_Grid, int a_SlotNum) override
 	{
 		UNUSED(a_SlotNum);
 		ASSERT(a_Grid == &m_Contents);