diff --git a/src/lib/utils/timestamp-to-iso.util.ts b/src/lib/utils/timestamp-to-iso.util.ts
index 54146f2..c6f5701 100644
--- a/src/lib/utils/timestamp-to-iso.util.ts
+++ b/src/lib/utils/timestamp-to-iso.util.ts
@@ -1,5 +1,5 @@
 import { Timestamp } from '@teacinema/contracts/gen/ts/google/protobuf/timestamp'
 
 export function timestampToISO(ts: Timestamp) {
-  new Date(ts.seconds * 1000 + ts.nanos / 1_000_000).toISOString()
+  return new Date(ts.seconds * 1000 + ts.nanos / 1_000_000).toISOString()
 }