diff --git a/git/cmd.py b/git/cmd.py
index e87a3b800..a036fd8f8 100644
--- a/git/cmd.py
+++ b/git/cmd.py
@@ -498,7 +498,7 @@ def readlines(self, size=-1):
         def __iter__(self):
             return self
 
-        def next(self):
+        def __next__(self):
             line = self.readline()
             if not line:
                 raise StopIteration