diff --git a/IPython/utils/openpy.py b/IPython/utils/openpy.py
index af56811..b5a6a39 100644
--- a/IPython/utils/openpy.py
+++ b/IPython/utils/openpy.py
@@ -74,7 +74,7 @@ def read_py_file(filename, skip_encoding_cookie=True):
     A unicode string containing the contents of the file.
     """
     filepath = Path(filename)
-    with filepath.open() as f:   # the open function defined in this module.
+    with open(filepath) as f:   # the open function defined in this module.
         if skip_encoding_cookie:
             return "".join(strip_encoding_cookie(f))
         else: