diff --git a/misago/readtracker/threadstracker.py b/misago/readtracker/threadstracker.py
index 3132aa40b7..e5c4d67b62 100644
--- a/misago/readtracker/threadstracker.py
+++ b/misago/readtracker/threadstracker.py
@@ -3,7 +3,7 @@
 from .cutoffdate import get_cutoff_date
 
 
-def make_read_aware(request, threads):
+def make_read_aware(request, threads, update_unread_private_threads=False):
     if not threads:
         return
 
@@ -29,6 +29,9 @@ def make_read_aware(request, threads):
 
     unread_threads = list(queryset)
 
+    if update_unread_private_threads:
+        request.user.unread_private_threads = len(unread_threads)
+
     for thread in threads:
         if thread.pk in unread_threads:
             thread.is_read = False
diff --git a/misago/threads/viewmodels/threads.py b/misago/threads/viewmodels/threads.py
index 8a54d5849d..11e2f8cf05 100644
--- a/misago/threads/viewmodels/threads.py
+++ b/misago/threads/viewmodels/threads.py
@@ -69,6 +69,7 @@ def __init__(self, request, category, list_type, start=0):
         except (EmptyPage, InvalidPage):
             raise Http404()
 
+        update_unread_private_threads = False
         if list_page.first:
             pinned_threads = list(
                 self.get_pinned_threads(
@@ -76,6 +77,14 @@ def __init__(self, request, category, list_type, start=0):
                 )
             )
             threads = list(pinned_threads) + list(list_page.object_list)
+            if category_model.name == "Private":
+                if not list_page.has_next():
+                    update_unread_private_threads = True
+                elif threads and threads[-1].last_post_on < get_cutoff_date(
+                    request.settings, request.user
+                ):
+                    update_unread_private_threads = True
+
         else:
             threads = list(list_page.object_list)
 
@@ -89,7 +98,9 @@ def __init__(self, request, category, list_type, start=0):
                 thread.is_read = False
                 thread.is_new = True
         else:
-            threadstracker.make_read_aware(request, threads)
+            threadstracker.make_read_aware(
+                request, threads, update_unread_private_threads
+            )
 
         self.filter_threads(request, threads)