diff --git a/stdlib/3/multiprocessing/context.pyi b/stdlib/3/multiprocessing/context.pyi
index caf4d123d..627c760f0 100644
--- a/stdlib/3/multiprocessing/context.pyi
+++ b/stdlib/3/multiprocessing/context.pyi
@@ -38,7 +38,7 @@ class BaseContext(object):
     # TODO: change return to SyncManager once a stub exists in multiprocessing.managers
     def Manager(self) -> Any: ...
     # TODO: change return to Pipe once a stub exists in multiprocessing.connection
-    def Pipe(self, duplex: bool) -> Any: ...
+    def Pipe(self, duplex: bool = ...) -> Any: ...
 
     def Barrier(self,
                 parties: int,