diff --git a/mobile/ios/NotificationService/NotificationService.swift b/mobile/ios/NotificationService/NotificationService.swift
index 0fffa19540..c10bb0f3fd 100644
--- a/mobile/ios/NotificationService/NotificationService.swift
+++ b/mobile/ios/NotificationService/NotificationService.swift
@@ -101,11 +101,13 @@ final class NotificationService: UNNotificationServiceExtension {
   ) {
     resolvedScope = nil
     handoff = BuzzNotificationHandoff(handler: contentHandler)
-    restrictedFallbackContent = Self.restrictedFallback(from: request.content)
     guard let content = request.content.mutableCopy() as? UNMutableNotificationContent else {
       finish(request.content)
       return
     }
+    // Workaround until https://github.com/block/buzz/pull/8431 lands.
+    if content.sound == nil { content.sound = .default }
+    restrictedFallbackContent = Self.restrictedFallback(from: content)
     bestAttemptContent = content
     var cleanUserInfo = content.userInfo
     cleanUserInfo.removeValue(forKey: BuzzPushNavigationTarget.userInfoKey)