diff --git a/server/src/event/ttnMessageReceivedEvent.ts b/server/src/event/ttnMessageReceivedEvent.ts
index f92d05a..cbf068f 100644
--- a/server/src/event/ttnMessageReceivedEvent.ts
+++ b/server/src/event/ttnMessageReceivedEvent.ts
@@ -12,7 +12,7 @@ export type TtnMessageReceivedEvent = {
     altitude: number;
   }[];
   gnssLocation: {
-    latitude: number | undefined;
-    longitude: number | undefined;
+    latitude?: number;
+    longitude?: number;
   }
 };