diff --git a/Lib/doctest.py b/Lib/doctest.py
index 0db59ba..e874a26 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -209,7 +209,10 @@
         filename = _module_relative_path(package, filename)
         if hasattr(package, '__loader__'):
             if hasattr(package.__loader__, 'get_data'):
-                return package.__loader__.get_data(filename), filename
+                file_contents = package.__loader__.get_data(filename)
+                # get_data() opens files as 'rb', so one must do the equivalent
+                # conversion as universal newlines would do.
+                return file_contents.replace(os.linesep, '\n'), filename
     return open(filename).read(), filename
 
 def _indent(s, indent=4):