diff --git a/ts/services/MessageUpdater.preload.ts b/ts/services/MessageUpdater.preload.ts
index 91c4db1800..4742286881 100644
--- a/ts/services/MessageUpdater.preload.ts
+++ b/ts/services/MessageUpdater.preload.ts
@@ -14,11 +14,19 @@ import * as Errors from '../types/errors.std.js';
 import { createLogger } from '../logging/log.std.js';
 import { isValidTapToView } from '../util/isValidTapToView.std.js';
 import { getMessageIdForLogging } from '../util/idForLogging.preload.js';
+import { getMessageSentTimestamp } from '../util/getMessageSentTimestamp.std.js';
 import { eraseMessageContents } from '../util/cleanup.preload.js';
 import { getSource, getSourceServiceId } from '../messages/sources.preload.js';
 import { isAciString } from '../util/isAciString.std.js';
 import { viewOnceOpenJobQueue } from '../jobs/viewOnceOpenJobQueue.preload.js';
 import { drop } from '../util/drop.std.js';
+import { isIncoming } from '../messages/helpers.std.js';
+import {
+  conversationJobQueue,
+  conversationQueueJobEnum,
+} from '../jobs/conversationJobQueue.preload.js';
+import { ReceiptType } from '../types/Receipt.std.js';
+import { isDirectConversation } from '../util/whatTypeOfConversation.dom.js';
 
 const log = createLogger('MessageUpdater');
 
@@ -99,12 +107,39 @@ export async function markViewOnceMessageViewed(
   if (!fromSync) {
     const senderE164 = getSource(message.attributes);
     const senderAci = getSourceServiceId(message.attributes);
-    const timestamp = message.get('sent_at');
+    const timestamp = getMessageSentTimestamp(message.attributes, { log });
 
     if (senderAci === undefined || !isAciString(senderAci)) {
       throw new Error('markViewOnceMessageViewed: senderAci is undefined');
     }
 
+    // Send viewed receipt to sender for incoming view-once messages
+    if (isIncoming(message.attributes)) {
+      const conversationId = message.get('conversationId');
+      const conversation = window.ConversationController.get(conversationId);
+      const isDirectConversationValue = conversation
+        ? isDirectConversation(conversation.attributes)
+        : true;
+
+      drop(
+        conversationJobQueue.add({
+          type: conversationQueueJobEnum.enum.Receipts,
+          conversationId,
+          receiptsType: ReceiptType.Viewed,
+          receipts: [
+            {
+              messageId: message.id,
+              conversationId,
+              senderE164,
+              senderAci,
+              timestamp,
+              isDirectConversation: isDirectConversationValue,
+            },
+          ],
+        })
+      );
+    }
+
     if (window.ConversationController.areWePrimaryDevice()) {
       log.warn(
         'markViewOnceMessageViewed: We are primary device; not sending view once open sync'
diff --git a/ts/test-mock/helpers.node.ts b/ts/test-mock/helpers.node.ts
index d7213593b4..808406b50c 100644
--- a/ts/test-mock/helpers.node.ts
+++ b/ts/test-mock/helpers.node.ts
@@ -6,7 +6,7 @@ import {
   type Device,
   type Group,
   PrimaryDevice,
-  type Proto,
+  Proto,
   StorageState,
 } from '@signalapp/mock-server';
 import { assert } from 'chai';
@@ -30,6 +30,30 @@ export function bufferToUuid(buffer: Buffer): string {
   ].join('-');
 }
 
+function isProfileKeyUpdate(flags: number | null | undefined): boolean {
+  if (flags == null) {
+    return false;
+  }
+  // eslint-disable-next-line no-bitwise
+  return (flags & Proto.DataMessage.Flags.PROFILE_KEY_UPDATE) !== 0;
+}
+
+export async function waitForNonProfileKeyUpdateMessage(
+  device: PrimaryDevice,
+  { maxAttempts = 5 }: { maxAttempts?: number } = {}
+): Promise<Awaited<ReturnType<PrimaryDevice['waitForMessage']>>> {
+  for (let i = 0; i < maxAttempts; i += 1) {
+    // eslint-disable-next-line no-await-in-loop
+    const message = await device.waitForMessage();
+    if (isProfileKeyUpdate(message.dataMessage.flags)) {
+      debug('Skipping profile key update');
+      continue;
+    }
+    return message;
+  }
+  throw new Error(`No message with body after ${maxAttempts} attempts`);
+}
+
 export async function typeIntoInput(
   input: Locator,
   additionalText: string,
diff --git a/ts/test-mock/messaging/expire_timer_version_test.node.ts b/ts/test-mock/messaging/expire_timer_version_test.node.ts
index fe67da52d2..924ff19a74 100644
--- a/ts/test-mock/messaging/expire_timer_version_test.node.ts
+++ b/ts/test-mock/messaging/expire_timer_version_test.node.ts
@@ -19,6 +19,7 @@ import {
   expectSystemMessages,
   typeIntoInput,
   waitForEnabledComposer,
+  waitForNonProfileKeyUpdateMessage,
 } from '../helpers.node.js';
 
 export const debug = createDebug('mock:test:messaging');
@@ -27,30 +28,6 @@ const IdentifierType = Proto.ManifestRecord.Identifier.Type;
 
 const DAY = 24 * 3600;
 
-function isProfileKeyUpdate(flags: number | null | undefined): boolean {
-  if (flags == null) {
-    return false;
-  }
-  // eslint-disable-next-line no-bitwise
-  return (flags & Proto.DataMessage.Flags.PROFILE_KEY_UPDATE) !== 0;
-}
-
-async function waitForNonProfileKeyUpdateMessage(
-  device: PrimaryDevice
-): Promise<{ body: string; dataMessage: Proto.IDataMessage }> {
-  const maxAttempts = 5;
-  for (let i = 0; i < maxAttempts; i += 1) {
-    // eslint-disable-next-line no-await-in-loop
-    const message = await device.waitForMessage();
-    if (isProfileKeyUpdate(message.dataMessage.flags)) {
-      debug('Skipping profile key update');
-      continue;
-    }
-    return message;
-  }
-  throw new Error(`No message with body after ${maxAttempts} attempts`);
-}
-
 describe('messaging/expireTimerVersion', function (this: Mocha.Suite) {
   this.timeout(durations.MINUTE);
 
diff --git a/ts/test-mock/pnp/pni_signature_test.node.ts b/ts/test-mock/pnp/pni_signature_test.node.ts
index 484477e3e2..3dd522ac7d 100644
--- a/ts/test-mock/pnp/pni_signature_test.node.ts
+++ b/ts/test-mock/pnp/pni_signature_test.node.ts
@@ -26,6 +26,7 @@ import {
   acceptConversation,
   expectSystemMessages,
   typeIntoInput,
+  waitForNonProfileKeyUpdateMessage,
   waitForEnabledComposer,
 } from '../helpers.node.js';
 
@@ -376,7 +377,8 @@ describe('pnp/PNI Signature', function (this: Mocha.Suite) {
 
     debug('Wait for a ACI message');
     {
-      const { source, body, serviceIdKind } = await stranger.waitForMessage();
+      const { source, body, serviceIdKind } =
+        await waitForNonProfileKeyUpdateMessage(stranger);
 
       assert.strictEqual(source, desktop, 'ACI message has valid source');
       assert.strictEqual(body, 'Hello ACI', 'ACI message has valid body');