diff --git a/src/allmydata/client.py b/src/allmydata/client.py
index 68bb6c0fb..f7b86f04d 100644
--- a/src/allmydata/client.py
+++ b/src/allmydata/client.py
@@ -90,6 +90,7 @@ def _valid_config():
             "readonly",
             "reserved_space",
             "storage_dir",
+            "plugins",
         ),
         "sftpd": (
             "accounts.file",