diff --git a/stdlib/2and3/sunau.pyi b/stdlib/2and3/sunau.pyi
index b957f5808..782ff7214 100644
--- a/stdlib/2and3/sunau.pyi
+++ b/stdlib/2and3/sunau.pyi
@@ -83,4 +83,5 @@ class Au_write:
 
 # Returns a Au_read if mode is rb and Au_write if mode is wb
 def open(f: _File, mode: Optional[str] = ...) -> Any: ...
-openfp = open
+if sys.version_info < (3, 9):
+    openfp = open