diff --git a/app/src/main/java/io/github/wulkanowy/services/sync/channels/UpcomingLessonsChannel.kt b/app/src/main/java/io/github/wulkanowy/services/sync/channels/UpcomingLessonsChannel.kt
index cd25eea6..41fb6192 100644
--- a/app/src/main/java/io/github/wulkanowy/services/sync/channels/UpcomingLessonsChannel.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/sync/channels/UpcomingLessonsChannel.kt
@@ -26,6 +26,7 @@ class UpcomingLessonsChannel @Inject constructor(
                 lockscreenVisibility = VISIBILITY_PUBLIC
                 setShowBadge(false)
                 enableVibration(false)
+                setSound(null, null)
             }
         )
     }