diff --git a/client/src/pages/journey/journeyModel.ts b/client/src/pages/journey/journeyModel.ts
index 0c1b26b5c..27138f66f 100644
--- a/client/src/pages/journey/journeyModel.ts
+++ b/client/src/pages/journey/journeyModel.ts
@@ -2,7 +2,7 @@
 export function journeyYearLabel(journey: {
   trip_date_min?: string | null;
   trip_date_max?: string | null;
-  created_at?: string | null;
+  created_at?: string | number | null;
 }): string {
   // The dates are calendar dates, so the year is read from the text, not through a Date in some zone.
   const from = journey.trip_date_min?.slice(0, 4);