diff --git a/lib/opc_interface.py b/lib/opc_interface.py
index 947b92f723ec4d73109226e0cebe43695d830e32..a715dfaf05431a30d84f613e14ffb7cfff77b268 100644
--- a/lib/opc_interface.py
+++ b/lib/opc_interface.py
@@ -69,7 +69,8 @@ def define_get_crosslet_statistics_parameters(object, idx):
 
     return object.add_method(idx, "record_cross", get_crosslet_statistics,
                              [subband, integration_time],
-                             [timestamp, cross, rcu])
+                             [timestamp, cross, rcusmode])
+
 
 def connect_to_server(url, port):
     client = Client("opc.tcp://{}:{}/".format(url, port))
@@ -77,6 +78,7 @@ def connect_to_server(url, port):
     client.load_type_definitions()
     return client
 
+
 def setup_server_metadata(server=None, port=55555):
     if server is None:
         server = Server()