diff --git a/boards/models/post.py b/boards/models/post.py
--- a/boards/models/post.py
+++ b/boards/models/post.py
@@ -298,7 +298,7 @@ class Post(models.Model):
         thread.last_edit_time = edit_time
         thread.save()
 
-    def get_url(self):
+    def get_url(self, thread=None):
         """
         Gets full url to the post.
         """
@@ -307,7 +307,10 @@ class Post(models.Model):
         link = cache.get(cache_key)
 
         if not link:
-            opening_id = self.get_thread().get_opening_post_id()
+            if not thread:
+                thread = self.get_thread()
+
+            opening_id = thread.get_opening_post_id()
 
             if self.id != opening_id:
                 link = reverse('thread', kwargs={
diff --git a/boards/templates/boards/post.html b/boards/templates/boards/post.html
--- a/boards/templates/boards/post.html
+++ b/boards/templates/boards/post.html
@@ -31,7 +31,7 @@
         <div class="message">
             <div class="post-info">
                 <span class="title">{{ post.title }}</span>
-                <a class="post_id" href="{% post_object_url post %}">
+                <a class="post_id" href="{% post_object_url post thread=thread %}">
                     ({{ post.id }}) </a>
                 [<span class="pub_time">{{ post.pub_time }}</span>]
                 {% if thread.archived %}
@@ -73,8 +73,7 @@
                     <div class="refmap">
                         {% trans "Replies" %}:
                         {% for ref_post in refposts %}
-                            <a href="{% post_object_url ref_post %}">&gt;&gt;{{ ref_post.id }}</a
-                                    >{% if not forloop.last %},{% endif %}
+                            <a href="{% post_object_url ref_post thread=thread %}">&gt;&gt;{{ ref_post.id }}</a>{% if not forloop.last %},{% endif %}
                         {% endfor %}
                     </div>
                 {% endif %}
diff --git a/boards/templates/boards/thread.html b/boards/templates/boards/thread.html
--- a/boards/templates/boards/thread.html
+++ b/boards/templates/boards/thread.html
@@ -33,16 +33,14 @@
 
     <div class="thread">
         {% with can_bump=thread.can_bump %}
-        {% with opening_post_id=thread.get_opening_post.id %}
         {% for post in thread.get_replies %}
             {% if forloop.first %}
-                {% post_view post moderator=moderator is_opening=True thread=thread can_bump=can_bump opening_post_id=opening_post_id %}
+                {% post_view post moderator=moderator is_opening=True thread=thread can_bump=can_bump opening_post_id=opening_post.id %}
             {% else %}
-                {% post_view post moderator=moderator is_opening=False thread=thread can_bump=can_bump opening_post_id=opening_post_id %}
+                {% post_view post moderator=moderator is_opening=False thread=thread can_bump=can_bump opening_post_id=opening_post.id %}
             {% endif %}
         {% endfor %}
         {% endwith %}
-        {% endwith %}
     </div>
 
     {% if not thread.archived %}
diff --git a/boards/templatetags/board.py b/boards/templatetags/board.py
--- a/boards/templatetags/board.py
+++ b/boards/templatetags/board.py
@@ -30,7 +30,12 @@ def post_url(*args, **kwargs):
 def post_object_url(*args, **kwargs):
     post = args[0]
 
-    return post.get_url()
+    if 'thread' in kwargs:
+        post_thread = kwargs['thread']
+    else:
+        post_thread = None
+
+    return post.get_url(thread=post_thread)
 
 
 @register.simple_tag(name='image_actions')
diff --git a/boards/views/thread.py b/boards/views/thread.py
--- a/boards/views/thread.py
+++ b/boards/views/thread.py
@@ -45,7 +45,7 @@ class ThreadView(BaseBoardView, PostMixi
                     float(context['posts_left']) /
                     neboard.settings.MAX_POSTS_PER_THREAD * 100)
 
-            context['opening_post'] = thread_to_show.get_opening_post()
+            context['opening_post'] = opening_post
 
             document = 'boards/thread.html'
         elif MODE_GALLERY == mode: