diff --git a/src/controllers/api/inventoryController.ts b/src/controllers/api/inventoryController.ts
index b4e0035d..33c6021f 100644
--- a/src/controllers/api/inventoryController.ts
+++ b/src/controllers/api/inventoryController.ts
@@ -16,6 +16,8 @@ import {
 } from "warframe-public-export-plus";
 import { handleSubsumeCompletion } from "./infestedFoundryController";
 import { allDailyAffiliationKeys } from "@/src/services/inventoryService";
+import { toOid } from "@/src/helpers/inventoryHelpers";
+import { Types } from "mongoose";
 
 export const inventoryController: RequestHandler = async (request, response) => {
     const account = await getAccountForRequest(request);
@@ -247,6 +249,8 @@ export const inventoryController: RequestHandler = async (request, response) =>
     // This determines if the "void fissures" tab is shown in navigation.
     inventoryResponse.HasOwnedVoidProjectionsPreviously = true;
 
+    inventoryResponse.LastInventorySync = toOid(new Types.ObjectId());
+
     response.json(inventoryResponse);
 };
 
diff --git a/src/models/inventoryModels/inventoryModel.ts b/src/models/inventoryModels/inventoryModel.ts
index fe8779af..a18788a8 100644
--- a/src/models/inventoryModels/inventoryModel.ts
+++ b/src/models/inventoryModels/inventoryModel.ts
@@ -1111,7 +1111,6 @@ const inventorySchema = new Schema<IInventoryDatabase, InventoryDocumentProps>(
         ChallengesFixVersion: Number,
         PlayedParkourTutorial: Boolean,
         SubscribedToEmailsPersonalized: Number,
-        LastInventorySync: Schema.Types.Mixed, // this should be Schema.Types.ObjectId, but older inventories may break with that.
         ActiveLandscapeTraps: [Schema.Types.Mixed],
         RepVotes: [Schema.Types.Mixed],
         LeagueTickets: [Schema.Types.Mixed],