diff --git a/extras/win32-portable/prepare_portable.py b/extras/win32-portable/prepare_portable.py
index 9418b8e10..6554a4939 100644
--- a/extras/win32-portable/prepare_portable.py
+++ b/extras/win32-portable/prepare_portable.py
@@ -87,6 +87,7 @@ PY_DLLS = [
     "_sqlite3.pyd",
     "_socket.pyd",
     "select.pyd",
+    "_ctypes.pyd",
 ]
 
 MSVCR_PUBLIC_KEY = "1fc8b3b9a1e18e3b"