diff --git a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineEventsGroups.kt b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineEventsGroups.kt
index 7738b6b680..a4bfa9e155 100644
--- a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineEventsGroups.kt
+++ b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineEventsGroups.kt
@@ -151,6 +151,6 @@ class VoiceBroadcastEventsGroup(private val group: TimelineEventsGroup) {
     }
 
     fun getDuration(): Int {
-        return group.events.mapNotNull { it.root.asMessageAudioEvent()?.duration }.reduceOrNull { acc, duration -> acc + duration } ?: 0
+        return group.events.mapNotNull { it.root.asMessageAudioEvent()?.duration }.sum()
     }
 }