diff --git a/pandora/item/urls.py b/pandora/item/urls.py
index 436212e..a789555 100644
--- a/pandora/item/urls.py
+++ b/pandora/item/urls.py
@@ -23,7 +23,7 @@ urlpatterns = patterns("item.views",
 
     #poster
     (r'^(?P<id>[A-Z0-9].+)/poster(?P<size>\d+)\.jpg$', 'poster'),
-    (r'^(?P<id>[A-Z0-9].+)/siteposter(?P<size>\d+)\.jpg$', 'siteposter'),
+    (r'^(?P<id>[A-Z0-9].+)/siteposter(?P<size>\d*)\.jpg$', 'siteposter'),
     (r'^(?P<id>[A-Z0-9].+)/poster\.jpg$', 'siteposter'),
     (r'^(?P<id>[A-Z0-9].+)/frameposter(?P<position>\d+).jpg$', 'poster_frame'),
 
diff --git a/pandora/item/views.py b/pandora/item/views.py
index 32a326e..1912fcf 100644
--- a/pandora/item/views.py
+++ b/pandora/item/views.py
@@ -604,6 +604,7 @@ def siteposter(request, id, size=None):
     poster = item.path('siteposter.jpg')
     poster = os.path.abspath(os.path.join(settings.MEDIA_ROOT, poster))
     if size:
+        size = int(size)
         image = Image.open(poster)
         image_size = max(image.size)
         if size < image_size: