diff --git a/web/redux/redux-setup.js b/web/redux/redux-setup.js
--- a/web/redux/redux-setup.js
+++ b/web/redux/redux-setup.js
@@ -14,6 +14,10 @@
   type ReplaceKeyserverOperation,
   keyserverStoreOpsHandlers,
 } from 'lib/ops/keyserver-store-ops.js';
+import {
+  type ReplaceThreadActivityEntryOperation,
+  threadActivityStoreOpsHandlers,
+} from 'lib/ops/thread-activity-store-ops.js';
 import {
   type ThreadStoreOperation,
   threadStoreOpsHandlers,
@@ -484,16 +488,33 @@
     state.messageStore.threads[activeThread]
   ) {
     const now = Date.now();
-    state = {
-      ...state,
-      threadActivityStore: {
-        ...state.threadActivityStore,
-        [(activeThread: string)]: {
-          ...state.threadActivityStore[activeThread],
+    const replaceOperation: ReplaceThreadActivityEntryOperation = {
+      type: 'replace_thread_activity_entry',
+      payload: {
+        id: activeThread,
+        threadActivityStoreEntry: {
+          ...state[activeThread],
           lastNavigatedTo: now,
         },
       },
     };
+
+    state = {
+      ...state,
+      threadActivityStore:
+        threadActivityStoreOpsHandlers.processStoreOperations(
+          state.threadActivityStore,
+          [replaceOperation],
+        ),
+    };
+
+    storeOperations = {
+      ...storeOperations,
+      threadActivityStoreOperations: [
+        ...storeOperations.threadActivityStoreOperations,
+        replaceOperation,
+      ],
+    };
   }
 
   if (updateActiveThreadOps.length > 0) {