diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimeline.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimeline.kt
index b67220edca..4821270869 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimeline.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimeline.kt
@@ -819,7 +819,7 @@ internal class DefaultTimeline(
         private val inMemorySendingEvents = Collections.synchronizedList<TimelineEvent>(ArrayList())
 
         fun getInMemorySendingEvents(): List<TimelineEvent> {
-            return inMemorySendingEvents
+            return inMemorySendingEvents.toList()
         }
 
         /**