diff --git a/src/c3nav/editor/models/changeset.py b/src/c3nav/editor/models/changeset.py
index fb2372f9..3ce5746e 100644
--- a/src/c3nav/editor/models/changeset.py
+++ b/src/c3nav/editor/models/changeset.py
@@ -8,6 +8,7 @@ from django.db import models, transaction
 from django.urls import reverse
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ungettext_lazy
+from rest_framework.exceptions import PermissionDenied
 
 from c3nav.editor.models.changedobject import ChangedObject
 from c3nav.editor.utils import is_created_pk
@@ -244,6 +245,10 @@ class ChangeSet(models.Model):
     def proposed(self):
         return self.state not in ('unproposed', 'rejected')
 
+    @property
+    def closed(self):
+        return self.state in ('finallyrejected', 'applied')
+
     def is_author(self, request):
         return (self.author == request.user or (self.author is None and not request.user.is_authenticated and
                                                 request.session.get('changeset', None) == self.pk))
@@ -257,7 +262,7 @@ class ChangeSet(models.Model):
             if self.pk is not None:
                 changeset = ChangeSet.objects.select_for_update().get(pk=self.pk)
                 if request is not None and not changeset.can_edit(request):
-                    raise PermissionError
+                    raise PermissionDenied
 
                 self._object_changed = False
                 yield changeset
diff --git a/src/c3nav/editor/templates/editor/changeset.html b/src/c3nav/editor/templates/editor/changeset.html
index ad20a6bf..688e833a 100644
--- a/src/c3nav/editor/templates/editor/changeset.html
+++ b/src/c3nav/editor/templates/editor/changeset.html
@@ -82,7 +82,7 @@
 {% endfor %}
 
 {% buttons %}
-    {% if editing %}
+    {% if active %}
         {% if can_delete %}
             <button type="submit" class="btn btn-danger" name="delete" value="1">{% trans 'Delete' %}</button>
         {% endif %}
@@ -97,7 +97,7 @@
                 <button type="submit" class="btn btn-default" name="unpropose" value="1">{% trans 'Unpropose' %}</button>
             {% endif %}
         </div>
-    {% elif can_edit %}
+    {% elif not changeset.closed %}
         <button type="submit" class="btn btn-primary pull-right" name="activate" value="1">{% trans 'Activate' %}</button>
     {% endif %}
 {% endbuttons %}
diff --git a/src/c3nav/editor/views/changes.py b/src/c3nav/editor/views/changes.py
index 848f6f8b..7e874278 100644
--- a/src/c3nav/editor/views/changes.py
+++ b/src/c3nav/editor/views/changes.py
@@ -19,9 +19,9 @@ from c3nav.mapdata.models.locations import LocationRedirect, LocationSlug
 @sidebar_view
 def changeset_detail(request, pk):
     changeset = request.changeset
-    editing = True
+    active = True
     if str(pk) != str(request.changeset.pk):
-        editing = False
+        active = False
         changeset = get_object_or_404(ChangeSet.qs_for_request(request), pk=pk)
 
     if not changeset.can_see(request):
@@ -29,7 +29,6 @@ def changeset_detail(request, pk):
 
     can_edit = changeset.can_edit(request)
     can_delete = changeset.can_delete(request)
-    editing = editing and can_edit
 
     if request.method == 'POST':
         restore = request.POST.get('restore')
@@ -51,8 +50,8 @@ def changeset_detail(request, pk):
             return redirect(reverse('editor.changesets.detail', kwargs={'pk': changeset.pk}))
 
         elif request.POST.get('activate') == '1':
-            with changeset.lock_to_edit(request) as changeset:
-                if changeset.can_edit(request):
+            with changeset.lock_to_edit() as changeset:
+                if not changeset.closed:
                     changeset.activate(request)
                     messages.success(request, _('You activated this change set.'))
                 else:
@@ -136,7 +135,7 @@ def changeset_detail(request, pk):
                 obj_still_exists = pk not in changeset.deleted_existing.get(obj.__class__, ())
 
             edit_url = None
-            if obj_still_exists and editing and not isinstance(obj, LocationRedirect):
+            if obj_still_exists and active and can_edit and not isinstance(obj, LocationRedirect):
                 reverse_kwargs = {'pk': obj.pk}
                 if hasattr(obj, 'level_id'):
                     reverse_kwargs['level'] = obj.level_id
@@ -264,7 +263,7 @@ def changeset_detail(request, pk):
         'can_edit': can_edit,
         'can_delete': can_delete,
         'can_unpropose': changeset.can_unpropose(request),
-        'editing': editing,
+        'active': active,
         'changed_objects': changed_objects_data,
     }