diff --git a/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/MatrixRoomInfo.kt b/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/MatrixRoomInfo.kt
index e335996cd0..b83c2c98d6 100644
--- a/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/MatrixRoomInfo.kt
+++ b/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/MatrixRoomInfo.kt
@@ -42,7 +42,7 @@ data class MatrixRoomInfo(
     val notificationCount: Long,
     val userDefinedNotificationMode: RoomNotificationMode?,
     val hasRoomCall: Boolean,
-    val activeRoomCallParticipants: ImmutableList<String>,
+    val activeRoomCallParticipants: ImmutableList<UserId>,
     val heroes: ImmutableList<MatrixUser>,
     val pinnedEventIds: ImmutableList<EventId>,
     val creator: UserId?,
diff --git a/libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/room/MatrixRoomInfoMapper.kt b/libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/room/MatrixRoomInfoMapper.kt
index 1126d3dab9..c7ed6c1205 100644
--- a/libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/room/MatrixRoomInfoMapper.kt
+++ b/libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/room/MatrixRoomInfoMapper.kt
@@ -50,7 +50,7 @@ class MatrixRoomInfoMapper {
             notificationCount = it.notificationCount.toLong(),
             userDefinedNotificationMode = it.cachedUserDefinedNotificationMode?.map(),
             hasRoomCall = it.hasRoomCall,
-            activeRoomCallParticipants = it.activeRoomCallParticipants.toImmutableList(),
+            activeRoomCallParticipants = it.activeRoomCallParticipants.map(::UserId).toImmutableList(),
             heroes = it.elementHeroes().toImmutableList(),
             pinnedEventIds = it.pinnedEventIds.map(::EventId).toImmutableList(),
         )
diff --git a/libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/room/FakeMatrixRoom.kt b/libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/room/FakeMatrixRoom.kt
index 8ff9d70bcc..076baf5f2b 100644
--- a/libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/room/FakeMatrixRoom.kt
+++ b/libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/room/FakeMatrixRoom.kt
@@ -531,7 +531,7 @@ fun aRoomInfo(
     userDefinedNotificationMode: RoomNotificationMode? = null,
     hasRoomCall: Boolean = false,
     userPowerLevels: ImmutableMap<UserId, Long> = persistentMapOf(),
-    activeRoomCallParticipants: List<String> = emptyList(),
+    activeRoomCallParticipants: List<UserId> = emptyList(),
     heroes: List<MatrixUser> = emptyList(),
     pinnedEventIds: List<EventId> = emptyList(),
     roomCreator: UserId? = null,