diff --git a/Lib/lib2to3/refactor.py b/Lib/lib2to3/refactor.py
index ae5e40f..3c06405 100644
--- a/Lib/lib2to3/refactor.py
+++ b/Lib/lib2to3/refactor.py
@@ -560,7 +560,7 @@
         block_lineno = None
         indent = None
         lineno = 0
-        for line in input.splitlines(True):
+        for line in input.splitlines(keepends=True):
             lineno += 1
             if line.lstrip().startswith(self.PS1):
                 if block is not None:
@@ -604,7 +604,7 @@
                            filename, lineno, err.__class__.__name__, err)
             return block
         if self.refactor_tree(tree, filename):
-            new = str(tree).splitlines(True)
+            new = str(tree).splitlines(keepends=True)
             # Undo the adjustment of the line numbers in wrap_toks() below.
             clipped, new = new[:lineno-1], new[lineno-1:]
             assert clipped == ["\n"] * (lineno-1), clipped