diff --git a/pisi/archive.py b/pisi/archive.py
index fdb74d0c..f723ac5c 100644
--- a/pisi/archive.py
+++ b/pisi/archive.py
@@ -10,7 +10,7 @@ import zipfile
 #pisi modules
 import util
 
-class ArchiveError:
+class ArchiveError(Exception):
     pass
 
 class ArchiveBase(object):