diff --git a/src/allmydata/test/common_util.py b/src/allmydata/test/common_util.py
index e63c3eef8..abf675644 100644
--- a/src/allmydata/test/common_util.py
+++ b/src/allmydata/test/common_util.py
@@ -134,6 +134,7 @@ def run_cli_native(verb, *args, **kwargs):
         stdin = TextIOWrapper(BytesIO(stdin), encoding)
         stdout = TextIOWrapper(BytesIO(), encoding)
         stderr = TextIOWrapper(BytesIO(), encoding)
+    options.stdin = stdin
     d = defer.succeed(argv)
     d.addCallback(
         partial(