diff --git a/src/lib/date.ts b/src/lib/date.ts
index 7fd376b7..6a967477 100644
--- a/src/lib/date.ts
+++ b/src/lib/date.ts
@@ -350,7 +350,7 @@ export function generateTimeSeries(
   return timeseries.map(t => {
     const { x, y, d } = lookup.get(t) || {};
 
-    return { x: t, d: d || x, y: y ?? null };
+    return { x: t, d: d ?? x, y: y ?? null };
   });
 }