diff --git a/photologue/models.py b/photologue/models.py
index c1148a9..0072f6d 100644
--- a/photologue/models.py
+++ b/photologue/models.py
@@ -502,7 +502,7 @@ class Photo(ImageModel):
         super().save(*args, **kwargs)
 
     def get_absolute_url(self):
-        return reverse('photologue:pl-photo', args=[self.slug])
+        return reverse('photologue:pl-photo', args=[self.pk])
 
     def public_galleries(self):
         """Return the public galleries to which this photo belongs."""
diff --git a/photologue/urls.py b/photologue/urls.py
index ff49533..5169131 100644
--- a/photologue/urls.py
+++ b/photologue/urls.py
@@ -12,6 +12,6 @@ urlpatterns = [
     path('gallery/<slug:slug>/', GalleryDetailView.as_view(), name='pl-gallery'),
     path('gallery/<slug:slug>/<int:owner>/', GalleryDetailView.as_view(), name='pl-gallery-owner'),
     path('gallery/<slug:slug>/download/', GalleryDownload.as_view(), name='pl-gallery-download'),
-    path('photo/<slug:slug>/', PhotoDetailView.as_view(), name='pl-photo'),
+    path('photo/<int:pk>/', PhotoDetailView.as_view(), name='pl-photo'),
     path('upload/', GalleryUpload.as_view(), name='pl-gallery-upload'),
 ]