diff --git a/SVSim.EmulatedEntrypoint/Controllers/AchievementController.cs b/SVSim.EmulatedEntrypoint/Controllers/AchievementController.cs
index 6f25c72..9655118 100644
--- a/SVSim.EmulatedEntrypoint/Controllers/AchievementController.cs
+++ b/SVSim.EmulatedEntrypoint/Controllers/AchievementController.cs
@@ -69,7 +69,7 @@ public class AchievementController : SVSimController
         }
 
         // Open inventory tx and grant via InventoryService.
-        await using var tx = await _inv.BeginAsync(viewerId, ct);
+        await using var tx = await _inv.BeginAsync(viewerId, ct, cfg => cfg.Source = GrantSource.AchievementReward);
 
         var granted = await tx.GrantAsync(
             catalogRow.RewardType,