diff --git a/apps/browse/feeds.py b/apps/browse/feeds.py
index aa02811ec73..2a2d885dfc6 100644
--- a/apps/browse/feeds.py
+++ b/apps/browse/feeds.py
@@ -39,8 +39,9 @@ def item_pubdate(self, addon):
 
     def item_guid(self, addon):
         """Guid for a particuar version (<item><guid>)"""
-        return reverse('addons.versions',
-                       args=[addon.id, addon.current_version])
+        url = reverse('addons.versions',
+                      args=[addon.id, addon.current_version])
+        return absolutify(url)
 
 
 class CategoriesRss(AddonFeedMixin, Feed):