diff --git a/kallithea/lib/utils2.py b/kallithea/lib/utils2.py
--- a/kallithea/lib/utils2.py
+++ b/kallithea/lib/utils2.py
@@ -99,14 +99,12 @@ def convert_line_endings(line, mode):
     :rtype: str
     :return: converted line according to mode
     """
-    from string import replace
-
     if mode == 0:
-        line = replace(line, '\r\n', '\n')
-        line = replace(line, '\r', '\n')
+        line = line.replace('\r\n', '\n')
+        line = line.replace('\r', '\n')
     elif mode == 1:
-        line = replace(line, '\r\n', '\r')
-        line = replace(line, '\n', '\r')
+        line = line.replace('\r\n', '\r')
+        line = line.replace('\n', '\r')
     elif mode == 2:
         line = re.sub("\r(?!\n)|(?<!\r)\n", "\r\n", line)
     return line