diff --git a/paramiko/file.py b/paramiko/file.py
index 6de2b9b..1971ce0 100644
--- a/paramiko/file.py
+++ b/paramiko/file.py
@@ -256,7 +256,7 @@ class BufferedFile (object):
         """
         lines = []
         bytes = 0
-        while 1:
+        while True:
             line = self.readline()
             if len(line) == 0:
                 break