diff --git a/app/src/main/java/de/bollwerk/app/notification/NotificationHelper.kt b/app/src/main/java/de/bollwerk/app/notification/NotificationHelper.kt
index f6c305f..5c5b53e 100644
--- a/app/src/main/java/de/bollwerk/app/notification/NotificationHelper.kt
+++ b/app/src/main/java/de/bollwerk/app/notification/NotificationHelper.kt
@@ -111,19 +111,22 @@ internal class NotificationHelper @Inject constructor(
         if (shouldSuppressNotification(senderId)) return false
 
         val senderNotificationId = senderId.hashCode()
-        val (contentText, pendingIntent) = synchronized(activeSenderNotificationIds) {
+        val (contentText, pendingIntent, senderCount) = synchronized(activeSenderNotificationIds) {
             activeSenderNotificationIds.add(senderNotificationId)
             activeSenderNamesById[senderNotificationId] = senderUsername
             val names = activeSenderNamesById.values.toList()
-            if (activeSenderNotificationIds.size == 1) {
-                Pair(
+            val count = activeSenderNotificationIds.size
+            if (count == 1) {
+                Triple(
                     "Neue Nachricht von $senderUsername",
-                    buildChatPendingIntent(senderId, senderUsername)
+                    buildChatPendingIntent(senderId, senderUsername),
+                    count
                 )
             } else {
-                Pair(
+                Triple(
                     buildSummaryText(names),
-                    buildMessagesPendingIntent()
+                    buildMessagesPendingIntent(),
+                    count
                 )
             }
         }
@@ -133,6 +136,7 @@ internal class NotificationHelper @Inject constructor(
             .setContentTitle("Bollwerk")
             .setContentText(contentText)
             .setPriority(NotificationCompat.PRIORITY_HIGH)
+            .setNumber(senderCount)
             .setAutoCancel(false)
             .setOngoing(true)
             .setContentIntent(pendingIntent)
@@ -175,11 +179,13 @@ internal class NotificationHelper @Inject constructor(
             if (remainingText == null) {
                 notificationManager.notify(MessagingService.NOTIFICATION_ID, buildIdleNotification())
             } else {
+                val remainingCount = activeSenderNotificationIds.size
                 val updatedNotification = NotificationCompat.Builder(context, CHANNEL_ID)
                     .setSmallIcon(R.drawable.ic_notification_message)
                     .setContentTitle("Bollwerk")
                     .setContentText(remainingText)
                     .setPriority(NotificationCompat.PRIORITY_HIGH)
+                    .setNumber(remainingCount)
                     .setAutoCancel(false)
                     .setOngoing(true)
                     .setContentIntent(buildMessagesPendingIntent())