diff --git a/IPython/external/__init__.py b/IPython/external/__init__.py
index b38110f..eedc338 100644
--- a/IPython/external/__init__.py
+++ b/IPython/external/__init__.py
@@ -2,4 +2,6 @@
 This package contains all third-party modules bundled with IPython.
 """
 
+from typing import List
+
 __all__: List[str] = []