diff --git a/IPython/terminal/ptutils.py b/IPython/terminal/ptutils.py
index 312b4d0..bc22f8e 100644
--- a/IPython/terminal/ptutils.py
+++ b/IPython/terminal/ptutils.py
@@ -47,7 +47,7 @@ def _elide(string, *, min_elide=30):
         return '{}.{}\N{HORIZONTAL ELLIPSIS}{}.{}'.format(object_parts[0], object_parts[1][0], object_parts[-2][-1], object_parts[-1])
 
     elif len(file_parts) > 3:
-        return '{}/{}\N{HORIZONTAL ELLIPSIS}{}/{}'.format(file_parts[0], file_parts[1][0], file_parts[-2][-1], file_parts[-1])
+        return ('{}' + os.sep + '{}\N{HORIZONTAL ELLIPSIS}{}' + os.sep + '{}').format(file_parts[0], file_parts[1][0], file_parts[-2][-1], file_parts[-1])
 
     return string