diff --git a/mrepo.py b/mrepo.py
index f83af40..a004739 100755
--- a/mrepo.py
+++ b/mrepo.py
@@ -656,6 +656,7 @@ def repomd(self):
 class MrepoMirrorException(Exception):
     def __init__(self, value):
         self.value = value
+        Exception.__init__(self)
 
     def __str__(self):
         return repr(self.value)
@@ -664,6 +665,7 @@ def __str__(self):
 class MrepoGenerateException(Exception):
     def __init__(self, value):
         self.value = value
+        Exception.__init__(self)
 
     def __str__(self):
         return repr(self.value)