diff --git a/tildes/tildes/models/topic/topic.py b/tildes/tildes/models/topic/topic.py
index 221d075..f2f80a9 100644
--- a/tildes/tildes/models/topic/topic.py
+++ b/tildes/tildes/models/topic/topic.py
@@ -419,6 +419,11 @@ class Topic(DatabaseModel):
         """Return the permalink for this topic."""
         return f"/~{self.group.path}/{self.topic_id36}/{self.url_slug}"
 
+    @property
+    def permalink_absolute(self) -> str:
+        """Return the absolute permalink for this topic (domain included)."""
+        return f"https://tildes.net{self.permalink}"
+
     @property
     def is_text_type(self) -> bool:
         """Return whether this is a text topic."""
diff --git a/tildes/tildes/templates/topic_listing.atom.jinja2 b/tildes/tildes/templates/topic_listing.atom.jinja2
index 06f5150..2d8a245 100644
--- a/tildes/tildes/templates/topic_listing.atom.jinja2
+++ b/tildes/tildes/templates/topic_listing.atom.jinja2
@@ -10,11 +10,11 @@
     {% for topic in topics %}
         <entry>
             <title><![CDATA[{{ topic.title }}]]></title>
-            <id>https://tildes.net{{ topic.permalink }}</id>
+            <id>{{ topic.permalink_absolute }}</id>
             {% if topic.is_link_type %}
                 <link rel="alternate" href="{{ topic.link }}"/>
             {% else %}
-                <link rel="alternate" href="{{ topic.permalink }}"/>
+                <link rel="alternate" href="{{ topic.permalink_absolute }}"/>
             {% endif %}
             <content type="html"><![CDATA[
                 {% if topic.is_link_type %}
@@ -23,7 +23,7 @@
                     {{ topic.rendered_html|safe }}
                     <hr/>
                 {% endif %}
-                <p>Comments URL: <a href="{{ topic.permalink }}">https://tildes.net{{ topic.permalink }}</a></p>
+                <p>Comments URL: <a href="{{ topic.permalink_absolute }}">{{ topic.permalink_absolute }}</a></p>
                 <p>Votes: {{ topic.num_votes }}</p>
                 <p>Comments: {{ topic.num_comments }}</p>
             ]]></content>
diff --git a/tildes/tildes/templates/topic_listing.rss.jinja2 b/tildes/tildes/templates/topic_listing.rss.jinja2
index 4baf187..505907f 100644
--- a/tildes/tildes/templates/topic_listing.rss.jinja2
+++ b/tildes/tildes/templates/topic_listing.rss.jinja2
@@ -15,7 +15,7 @@
             {% if topic.is_link_type %}
                 <link>{{ topic.link }}</link>
             {% else %}
-                <link>{{ topic.permalink }}</link>
+                <link>{{ topic.permalink_absolute }}</link>
             {% endif %}
             <description><![CDATA[
                 {% if topic.is_link_type %}
@@ -24,12 +24,12 @@
                     {{ topic.rendered_html|safe }}
                     <hr/>
                 {% endif %}
-                <p>Comments URL: <a href="{{ topic.permalink }}">https://tildes.net{{ topic.permalink }}</a></p>
+                <p>Comments URL: <a href="{{ topic.permalink_absolute }}">{{ topic.permalink_absolute }}</a></p>
                 <p>Votes: {{ topic.num_votes }}</p>
                 <p>Comments: {{ topic.num_comments }}</p>
             ]]></description>
             <author>{{ topic.user.username }}</author>
-            <comments>{{ topic.permalink }}</comments>
+            <comments>{{ topic.permalink_absolute }}</comments>
             <pubDate>{{ topic.created_time.strftime("%a, %d %b %Y %T %z") }}</pubDate>
         </item>
     {% endfor %}