diff --git a/frontend/src/lib/activityUrlState.ts b/frontend/src/lib/activityUrlState.ts
index f8c25ce8..b8297365 100644
--- a/frontend/src/lib/activityUrlState.ts
+++ b/frontend/src/lib/activityUrlState.ts
@@ -33,7 +33,7 @@ export const RUN_STATUSES: readonly RunStatusFilter[] = [
   "ok",
 ];
 
-export const WINDOW_HOURS: Record<ActivityWindow, number> = {
+const WINDOW_HOURS: Record<ActivityWindow, number> = {
   "1h": 1,
   "24h": 24,
   "7d": 24 * 7,