diff --git a/Lib/StringIO.py b/Lib/StringIO.py
index 189d368..815bce6 100644
--- a/Lib/StringIO.py
+++ b/Lib/StringIO.py
@@ -64,10 +64,10 @@
     def __iter__(self):
         return self
 
-    def next(self):
+    def __next__(self):
         """A file object is its own iterator, for example iter(f) returns f
         (unless f is closed). When a file is used as an iterator, typically
-        in a for loop (for example, for line in f: print line), the next()
+        in a for loop (for example, for line in f: print line), the __next__()
         method is called repeatedly. This method returns the next input line,
         or raises StopIteration when EOF is hit.
         """