diff --git a/lsh/__init__.py b/lsh/__init__.py
index 7403f25..35cea77 100644
--- a/lsh/__init__.py
+++ b/lsh/__init__.py
@@ -129,7 +129,7 @@ def _insert_lsh(self,lsh,doc_id,date_added):
     def prepare_dup_buckets(cls, buckets, id=None):
         # logging.debug('buckets: %s', buckets)
         all = list(set(reduce(list.__add__, buckets, [])))
-        if id:
+        if id != None:
             all.remove(id)
         return all