diff --git a/db/migrate/20111012215141_move_photos_to_their_own_table.rb b/db/migrate/20111012215141_move_photos_to_their_own_table.rb
index 8c7479934..0bec98f25 100644
--- a/db/migrate/20111012215141_move_photos_to_their_own_table.rb
+++ b/db/migrate/20111012215141_move_photos_to_their_own_table.rb
@@ -26,8 +26,13 @@ FROM posts
 WHERE type = 'Photo'
 SQL
 
-    execute "UPDATE aspect_visibilities AS av, photos SET av.shareable_type='Photo' WHERE av.shareable_id=photos.id"
-    execute "UPDATE share_visibilities AS sv, photos SET sv.shareable_type='Photo' WHERE sv.shareable_id=photos.id"
+    if postgres?
+      execute "UPDATE aspect_visibilities AS av SET shareable_type='Photo' FROM photos WHERE av.shareable_id=photos.id"
+      execute "UPDATE share_visibilities AS sv SET shareable_type='Photo' FROM photos WHERE sv.shareable_id=photos.id"
+    else
+      execute "UPDATE aspect_visibilities AS av, photos SET av.shareable_type='Photo' WHERE av.shareable_id=photos.id"
+      execute "UPDATE share_visibilities AS sv, photos SET sv.shareable_type='Photo' WHERE sv.shareable_id=photos.id"
+    end
 
     # all your base are belong to us!
     execute "DELETE FROM posts WHERE type='Photo'"