diff --git a/app/src/main/java/org/thoughtcrime/securesms/stories/viewer/page/StoryViewerPageRepository.kt b/app/src/main/java/org/thoughtcrime/securesms/stories/viewer/page/StoryViewerPageRepository.kt
index 43735c0d2a..c4fca53f0c 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/stories/viewer/page/StoryViewerPageRepository.kt
+++ b/app/src/main/java/org/thoughtcrime/securesms/stories/viewer/page/StoryViewerPageRepository.kt
@@ -171,7 +171,7 @@ open class StoryViewerPageRepository(context: Context, private val storyViewStat
 
   fun markViewed(storyPost: StoryPost) {
     if (!storyPost.conversationMessage.messageRecord.isOutgoing) {
-      SignalExecutors.BOUNDED.execute {
+      SignalExecutors.SERIAL.execute {
         val markedMessageInfo = SignalDatabase.messages.setIncomingMessageViewed(storyPost.id)
         if (markedMessageInfo != null) {
           ApplicationDependencies.getDatabaseObserver().notifyConversationListListeners()