diff --git a/src/services/worldStateService.ts b/src/services/worldStateService.ts
index c8c1181f..decf7019 100644
--- a/src/services/worldStateService.ts
+++ b/src/services/worldStateService.ts
@@ -3639,6 +3639,15 @@ export const getWorldState = (buildLabel?: string): IWorldState => {
     }
     worldState.Tmp = JSON.stringify(tmp);
 
+    // This must be the last field in these versions.
+    if (
+        buildLabel &&
+        version_compare(buildLabel, "2016.08.19.17.12") >= 0 &&
+        version_compare(buildLabel, "2017.05.05.15.41") <= 0
+    ) {
+        worldState.WorldSeed = "4763605";
+    }
+
     return worldState;
 };
 
diff --git a/src/types/worldStateTypes.ts b/src/types/worldStateTypes.ts
index 4c6aef44..10386dd6 100644
--- a/src/types/worldStateTypes.ts
+++ b/src/types/worldStateTypes.ts
@@ -2,6 +2,7 @@ import type { IMissionReward, TFaction, TMissionType } from "warframe-public-exp
 import type { IMongoDate, IOid } from "./commonTypes.ts";
 
 export interface IWorldState {
+    WorldSeed?: string;
     Version: number; // for goals
     BuildLabel: string;
     Time: number;