diff --git a/error.py b/error.py
index 95231e6..8559d91 100644
--- a/error.py
+++ b/error.py
@@ -59,7 +59,7 @@ class PullRequestError(Exception):
   """ pull request to Gitee did not succeed.
   """
   def __init__(self, reason):
-    super.__init__()
+    super(PullRequestError, self).__init__()
     self.reason = reason
   
   def __str__(self):