diff --git a/app/models.py b/app/models.py
index 666e687..41f98e5 100644
--- a/app/models.py
+++ b/app/models.py
@@ -164,6 +164,7 @@ class Topics(Model):
                 GROUP BY thread_id
             )
             SELECT
+                threads.id,
                 threads.title,
                 threads.slug,
                 threads.created_at,
diff --git a/app/routes/mod.py b/app/routes/mod.py
index e032cd2..d164c32 100644
--- a/app/routes/mod.py
+++ b/app/routes/mod.py
@@ -62,7 +62,7 @@ def move_thread(thread_id):
     if not target_topic:
         abort(404)
     thread.update({'topic_id': target_topic.id})
-    return redirect(url_for('threads.thread', slug=thread.slug))
+    return redirect(url_for('threads.thread_by_id', thread_id=thread.id))
 
 @bp.post('/threads/<int:thread_id>/lock/')
 def lock_thread(thread_id):
@@ -70,7 +70,7 @@ def lock_thread(thread_id):
     if not thread:
         abort(404)
     thread.update({'is_locked': request.form.get('lock')})
-    return redirect(url_for('threads.thread', slug=thread.slug))
+    return redirect(url_for('threads.thread_by_id', thread_id=thread.id))
 
 @bp.post('/threads/<int:thread_id>/sticky/')
 def sticky_thread(thread_id):
@@ -78,7 +78,7 @@ def sticky_thread(thread_id):
     if not thread:
         abort(404)
     thread.update({'is_stickied': request.form.get('sticky')})
-    return redirect(url_for('threads.thread', slug=thread.slug))
+    return redirect(url_for('threads.thread_by_id', thread_id=thread.id))
 
 @bp.post('/users/<int:user_id>/make-guest/')
 @csrf_verified
diff --git a/app/routes/threads.py b/app/routes/threads.py
index 7db0c3d..994c970 100644
--- a/app/routes/threads.py
+++ b/app/routes/threads.py
@@ -5,11 +5,21 @@ import math
 
 bp = Blueprint('threads', __name__, url_prefix='/threads/')
 
-@bp.get('/<slug>/')
-def thread(slug):
-    thread = Threads.find({'slug': slug})
+@bp.get('/<int:thread_id>/')
+def thread_by_id(thread_id):
+    thread = Threads.find({'id': thread_id})
     if not thread:
         abort(404)
+    return redirect(url_for('.thread', thread_id=thread_id, slug=thread.slug, **request.args))
+
+@bp.get('/<int:thread_id>/<slug>/')
+def thread(thread_id, slug):
+    thread = Threads.find({'id': thread_id})
+    if not thread:
+        abort(404)
+    if thread.slug != slug:
+        return redirect(url_for('.thread', thread_id=thread_id, slug=thread.slug, **request.kwargs))
+
     topic = Topics.find({'id': thread.topic_id})
     started_by = Users.find({'id': thread.user_id})
     PER_PAGE = 10
@@ -34,21 +44,21 @@ def thread(slug):
             abort(404)
     return render_template('threads/thread.html', thread=thread, posts=thread.get_posts(PER_PAGE, page), page=page, page_count=page_count, topic=topic, started_by=started_by, topics=Topics.get_list(), Reactions=Reactions)
 
-@bp.post('/<slug>/reply/')
+@bp.post('/<int:thread_id>/reply/')
 @login_required
-def reply(slug):
+def reply(thread_id):
     user = get_active_user()
-    thread = Threads.find({'slug': slug})
+    thread = Threads.find({'id': thread_id})
     if not thread:
         abort(404)
     if thread.locked() and not user.is_mod():
         # TODO: flash
-        return redirect(url_for('.thread', slug=slug))
+        return redirect(url_for('.thread_by_id', thread_id=thread_id))
     post = Posts.new(user.id, thread.id, request.form.get('babycode_content'))
-    return redirect(url_for('.thread', slug=slug, after=post.id, _anchor=f'post-{post.id}'))
+    return redirect(url_for('.thread_by_id', thread_id=thread_id, after=post.id, _anchor=f'post-{post.id}'))
 
-@bp.get('/<slug>/feed.atom/')
-def feed(slug):
+@bp.get('/<int:thread_id>/feed.atom/')
+def feed(thread_id):
     return 'stub'
 
 @bp.get('/new/')
diff --git a/app/templates/threads/thread.html b/app/templates/threads/thread.html
index 92ae275..cf5b434 100644
--- a/app/templates/threads/thread.html
+++ b/app/templates/threads/thread.html
@@ -23,7 +23,7 @@
   <button>Subscribe</button>
   <button disabled title="This feature requires JavaScript to be enabled.">Bookmark&hellip;</button>
   {%- endif -%}
-  <a href="{{url_for('threads.feed', slug=thread.slug)}}" class="linkbutton rss">Subscribe via RSS</a>
+  <a href="{{url_for('threads.feed', thread_id=thread.id)}}" class="linkbutton rss">Subscribe via RSS</a>
 </fieldset>
 {%- if is_mod() -%}
 <fieldset class="plank even no-shadow minimal thread-actions">
@@ -64,7 +64,7 @@
   </fieldset>
 </div>
 {%- if is_logged_in() -%}
-<form action="{{url_for('threads.reply', slug=thread.slug)}}" method="POST" class="plank post-edit-form">
+<form action="{{url_for('threads.reply', thread_id=thread.id)}}" method="POST" class="plank post-edit-form">
   <h2 class="info">Reply to "{{thread.title}}"</h2>
   {{- babycode_editor_component() -}}
   <span>
diff --git a/app/templates/topics/topic.html b/app/templates/topics/topic.html
index 973471d..0a31159 100644
--- a/app/templates/topics/topic.html
+++ b/app/templates/topics/topic.html
@@ -48,10 +48,10 @@
 {%- for thread in threads -%}
 <div class="topic-info plank">
   <div class="title-container">
-    <span class="info thread-title-counter"><a href="{{url_for('threads.thread', slug=thread.slug)}}">{{thread.title}}</a></span>
+    <span class="info thread-title-counter"><a href="{{url_for('threads.thread_by_id', thread_id=thread.id)}}">{{thread.title}}</a></span>
     <ul class="horizontal"></ul>
     {%- if thread.posts_count / 10 > 1 -%}
-    {{pager(0, (((thread.posts_count / 10) | round(0, 'ceil') )| int), 'flex-last', url=url_for('threads.thread', slug=thread.slug))}}
+    {{pager(0, (((thread.posts_count / 10) | round(0, 'ceil') )| int), 'flex-last', url=url_for('threads.thread_by_id', thread_id=thread.id))}}
     {%- endif -%}
   </div>
   <span>Started by <a href="{{url_for('users.user_page', username=thread.started_by)}}">{{thread.started_by_display_name if thread.started_by_display_name else thread.started_by}}</a> on {{timestamp(thread.created_at)}}</span>
diff --git a/app/util.py b/app/util.py
index 6239dc0..a9fbf2d 100644
--- a/app/util.py
+++ b/app/util.py
@@ -11,7 +11,7 @@ def get_post_url(post_id, _anchor=False, external=False):
 
     anchor = None if not _anchor else f'post-{post_id}'
 
-    return url_for('threads.thread', slug=thread.slug, after=post_id, _external=external, _anchor=anchor)
+    return url_for('threads.thread_by_id', thread_id=thread.id, after=post_id, _external=external, _anchor=anchor)
 
 def dict_to_query_string(d) -> str:
     return '?' + '&'.join([f'{key}={str(value)}' for key, value in d.items()])