diff --git a/util/pilerpurge.py b/util/pilerpurge.py
index cca0119..fd6b1f7 100755
--- a/util/pilerpurge.py
+++ b/util/pilerpurge.py
@@ -85,7 +85,7 @@
     cursor = opts['db'].cursor()
 
     cursor.execute("SELECT i, piler_id, attachment_id, refcount FROM " +
-                   "v_attachment WHERE i IN (%s)" %
+                   "v_attachment WHERE refcount=0 AND i IN (%s)" %
                    (format), opts['referenced_attachments'])
 
     while True: