diff --git a/tap_salesforce/__init__.py b/tap_salesforce/__init__.py
index 13199d0..0eb9c75 100644
--- a/tap_salesforce/__init__.py
+++ b/tap_salesforce/__init__.py
@@ -227,7 +227,7 @@ def do_discover(sf):
 
         if replication_key:
             mdata = metadata.write(
-                mdata, (), 'valid-replication-keys', [replication_key])
+                mdata, (), 'replication-key', replication_key)
         else:
             mdata = metadata.write(
                 mdata,