diff --git a/vector/src/main/java/im/vector/app/features/voicebroadcast/VoiceBroadcastPlayer.kt b/vector/src/main/java/im/vector/app/features/voicebroadcast/VoiceBroadcastPlayer.kt
index bb5fe5c37d..2c892c8306 100644
--- a/vector/src/main/java/im/vector/app/features/voicebroadcast/VoiceBroadcastPlayer.kt
+++ b/vector/src/main/java/im/vector/app/features/voicebroadcast/VoiceBroadcastPlayer.kt
@@ -41,6 +41,7 @@ import org.matrix.android.sdk.api.session.room.timeline.Timeline
 import org.matrix.android.sdk.api.session.room.timeline.TimelineEvent
 import org.matrix.android.sdk.api.session.room.timeline.TimelineSettings
 import timber.log.Timber
+import java.util.concurrent.CopyOnWriteArrayList
 import javax.inject.Inject
 import javax.inject.Singleton
 
@@ -84,7 +85,7 @@ class VoiceBroadcastPlayer @Inject constructor(
             listeners.forEach { it.onStateChanged(value) }
         }
     private var currentRoomId: String? = null
-    private var listeners = mutableListOf<Listener>()
+    private var listeners = CopyOnWriteArrayList<Listener>()
 
     fun playOrResume(roomId: String, eventId: String) {
         val hasChanged = currentVoiceBroadcastId != eventId
diff --git a/vector/src/main/java/im/vector/app/features/voicebroadcast/VoiceBroadcastRecorderQ.kt b/vector/src/main/java/im/vector/app/features/voicebroadcast/VoiceBroadcastRecorderQ.kt
index cd1a61b986..5285dc5e3b 100644
--- a/vector/src/main/java/im/vector/app/features/voicebroadcast/VoiceBroadcastRecorderQ.kt
+++ b/vector/src/main/java/im/vector/app/features/voicebroadcast/VoiceBroadcastRecorderQ.kt
@@ -23,6 +23,7 @@ import androidx.annotation.RequiresApi
 import im.vector.app.features.voice.AbstractVoiceRecorderQ
 import org.matrix.android.sdk.api.extensions.tryOrNull
 import org.matrix.android.sdk.api.session.content.ContentAttachmentData
+import java.util.concurrent.CopyOnWriteArrayList
 
 @RequiresApi(Build.VERSION_CODES.Q)
 class VoiceBroadcastRecorderQ(
@@ -38,7 +39,7 @@ class VoiceBroadcastRecorderQ(
             listeners.forEach { it.onStateUpdated(value) }
         }
 
-    private val listeners = mutableListOf<VoiceBroadcastRecorder.Listener>()
+    private val listeners = CopyOnWriteArrayList<VoiceBroadcastRecorder.Listener>()
 
     override val outputFormat = MediaRecorder.OutputFormat.MPEG_4
     override val audioEncoder = MediaRecorder.AudioEncoder.HE_AAC