diff --git a/mitogen/fork.py b/mitogen/fork.py
index a247fd5b..2d82eb79 100644
--- a/mitogen/fork.py
+++ b/mitogen/fork.py
@@ -185,7 +185,7 @@ class Connection(mitogen.parent.Connection):
         pid = os.fork()
         if pid:
             childfp.close()
-            return Process(pid, parentfp)
+            return Process(pid, stdin=parentfp, stdout=parentfp)
         else:
             parentfp.close()
             self._wrap_child_main(childfp)